The Qur’anic Root Ṣ L B (صَلَبَ)
Hardness and firmness, the backbone and descent, and crucifying a human being
Qur’anic and lexical forms
صُلْب
(ṣulb)
Noun: backbone; one Qur’anic occurrence
أَصْلَاب
(aṣlāb)
Plural of ṣulb; one Qur’anic occurrence concerning descent
صَلَبَ
(ṣalaba)
Form I verb; two Qur’anic occurrences, active and passive
صَلَّبَ
(ṣallaba)
Form II verb; four Qur’anic occurrences
صَلُبَ
(ṣaluba)
Became hard; a lexical form, not Qur’anic
صَلَابَة
(ṣalābah)
Verbal noun: hardness and firmness; not Qur’anic
صَلْب
(ṣalb)
Verbal noun: crucifying; not Qur’anic
صَلِيب
(ṣalīb)
Hard; cross; also fat, according to usage; not Qur’anic
صُلَّبِيَّة
(ṣullabiyyah)
Whetstone in lexical use; not Qur’anic
مَصْلُوب
(maṣlūb)
Passive participle: crucified; not Qur’anic
تَصَلَّبَ
(taṣallaba)
Became hard or firm; not Qur’anic
اصْطَلَبَ
(iṣṭalaba)
Extracting bone fat in lexical use; not Qur’anic
1. Introduction and semantic field
The three-letter Arabic root Ṣ L B has several important uses: physical hardness and firmness, the bony structure of the back, a child’s descent from the father, and fastening or suspending a person on wood or another structure for punishment and torture. Its family includes صُلْب, صَلَابَة, صَلِيب, صَلَبَ, and صَلَّبَ.
In the Qur’an, the root occurs in two distinct fields. First, الصُّلْب and its plural أَصْلَاب concern the bony back and descent. Second, the verbs صَلَبَ and صَلَّبَ occur in contexts of punishment, threats of torture, and crucifixion.
Despite their shared root letters, these forms should not all be reduced to a single expression such as “making hard.” Hardness is a physical quality; ṣulb as backbone names a bodily part; and ṣalb in punitive use is a specific act.
The root occurs eight times in the Qur’an: twice as the noun ṣulb and its plural, twice as the Form I verb ṣalaba, and four times as the Form II verb ṣallaba.
2. Semantic core and important forms
Hardness and firmness
In Arabic, صَلُبَ الشَّيْءُ means that something became hard and firm. صَلَابَة likewise refers to hardness, solidity, and resistance to softness or deformation.
A stone that does not readily break, firm ground, and a strong tool can be described using this lexical family.
In this use, the central meaning concerns a perceptible quality: a body resists pressure, breaking, or a change of shape.
Arabic does not restrict hardness to physical objects. Expressions such as صُلْبُ الرَّأْيِ and صُلْبٌ فِي دِينِهِ describe someone’s firmness of judgment or steadfastness in belief.
These are figurative uses. Calling someone firm in judgment does not give his thought the material properties of stone; it expresses steadfastness or difficulty in changing his position.
Such steadfastness is not inherently a moral virtue. Someone may stand firm in truth or obstinately persist in falsehood. Its value depends on what is upheld, rather than on the description ṣulb alone.
Two lexical branches in classical sources
In Maqāyīs al-Lughah, Ibn Fāris identifies two principles for Ṣ L B:
الصَّادُ وَاللَّامُ وَالْبَاءُ أَصْلَانِ: أَحَدُهُمَا يَدُلُّ عَلَى الشِّدَّةِ وَالْقُوَّةِ، وَالْآخَرُ جِنْسٌ مِنَ الْوَدَكِ
al-ṣādu wa-al-lāmu wa-al-bāʾu aṣlāni: aḥaduhumā yadullu ʿalā al-shiddati wa-al-quwwati, wa-al-ākharu jinsun mina al-wadaki
“Ṣād, lām, and bāʾ have two principles: one indicates hardness and strength, and the other a kind of fat.”
The first principle covers hardness and firmness. Ibn Fāris also associates calling the back ṣulb with its strength.
The second concerns ṣalīb as bone fat: grease extracted from bones and their remains.
In explaining the designation maṣlūb, Ibn Fāris also reports a possibility involving the flow of fat. This is a classical lexical analysis; by itself, it does not establish that the punitive meaning historically developed from the use concerning fat.
The two branches of the lexical analysis should therefore be retained. Similar word forms do not license a definitive account of how every meaning originated.
Maqāyīs al-Lughah: two lexical principles and the analysis of maṣlūb
Important forms in the family
صَلُبَ يَصْلُبُ is the Form I verb meaning to become hard or firm. Its familiar verbal noun is صَلَابَة.
صُلْب denotes the backbone or the vertebrate portion of the back. Its plurals include أَصْلَاب and أَصْلُب. Both صُلْب and أَصْلَاب occur in the Qur’an.
صَلْب as a verbal noun concerns crucifying a person or fastening and suspending someone on a structure.
Transitive صَلَبَ يَصْلِبُ means to crucify, fasten to a gibbet, or suspend on wood for punishment. This verb occurs in the Qur’an.
صَلَّبَ is Form II. In Qur’anic use, it belongs to the same field of crucifying a human being.
صَلِيب is an adjective meaning hard or firm in one use; in another, it denotes the wooden cross, its structure, or the sign of the cross. This word does not occur in the Qur’an.
صُلَّبَة and صُلَّبِيَّة in some lexical uses refer to hard stone or stone used to sharpen tools.
مَصْلُوب is the passive participle of the verb of crucifying and describes someone who has been crucified.
تَصَلَّبَ means to become hard, solid, or firm.
In the older use concerning bones, اصْطَلَبَ refers to collecting and cooking them to extract their fat.
All these forms are recorded in Arabic. The forms actually occurring in the Qur’an, however, are limited to ṣulb, aṣlāb, and the Form I and Form II verbs of crucifying.
3. Physical imagery and older Arabic usage
The backbone: a firm part of the body
One of the root’s clearest uses names the bony structure of the back.
Lisān al-ʿArab describes ṣulb as the bone extending from the upper back to its terminal bone. Any vertebrate portion of the back also falls within this semantic field.
Ṣulb therefore need not mean just one vertebra or a single bone; it can refer to the back’s bony structure as a whole.
This use has a clear connection with hardness and firmness. The vertebral column forms part of the body’s supporting structure and has bony solidity compared with soft tissues.
Nevertheless, the noun ṣulb does not simply mean “hard.” It has become the name of a bodily part and should be understood in a sentence according to that established use.
Ṣulb in expressions of descent
Arabic uses مِنْ صُلْبِ فُلَانٍ for a child or line of descent originating from a person.
Here, ṣulb is no longer merely a bony region. The father’s body is used to express descent.
This provides a concrete image for a relationship of kinship. A person belongs to his father’s line; it does not mean that the child’s entire body was formed directly from the bones of the father’s back.
The distinction matters in Al-Nisāʾ 4:23, where أَصْلَابِكُمْ occurs in a statement about offspring and marriage.
Poetic evidence concerning hardness
Arabic poetry uses descriptions from this family for physical hardness, firmness of limbs, and even forceful movement or sound.
For example, a poem attributed to al-Aʿshā uses the verb صَلَّبَها to describe a she-camel’s body becoming strong through feed, grazing, and a period without bearing young. Here, the verb concerns bodily hardness and strength, rather than suspension or punishment.
Poetry attributed to Imruʾ al-Qays also contains السِّنَانِ الصُّلَّبِيِّ. In explaining this very witness, Lisān al-ʿArab identifies sinān as a whetstone; it should therefore not immediately be translated as a spearhead here. The same source also records ṣullabiyy for something polished and sharpened with such stone.
These witnesses show material uses of hardness and firmness in transmitted Arabic poetry. By themselves, however, they do not establish the historical order in which these meanings and legal or religious terms arose.
The date, attribution, and variant readings of each verse of poetry require separate examination. Especially for al-Aʿshā, whose lifetime approached the Islamic period, attribution alone does not establish a poem’s pre-Qur’anic date.
Lisān al-ʿArab: lexical forms and the witnesses from al-Aʿshā and Imruʾ al-Qays
The cross as a sign and structure
In poetry by the pre-Islamic poet al-Nābighah al-Dhubyānī, ṣalīb describes an erected sign:
ظَلَّتْ أَقَاطِيعُ أَنْعَامٍ مُؤَبَّلَةٍ
لَدَى صَلِيبٍ عَلَى الزَّوْرَاءِ مَنْصُوبِ
ẓallat aqāṭīʿu anʿāmin muʾabbalatin / ladā ṣalībin ʿalā al-zawrāʾi manṣūbi
“Herds of tended livestock remained beside a cross erected at al-Zawrāʾ.”
Here, ṣalīb is an erected object, and manṣūb indicates its standing in place.
Classical explanations associate this cross with a Christian sign at the location mentioned. This use shows that ṣalīb could refer to a particular, recognizable sign in pre-Islamic Arabic.
Muʿjam al-Buldān, al-Zawrāʾ: al-Nābighah’s witness and the cross sign
The witness matters for the word’s history, but it does not itself describe how a human being was crucified. The noun for the cross as a sign and the verb of crucifying are related; their individual uses nevertheless require separate examination.
The word ṣalīb itself does not occur directly in the Qur’an. What occurs is the verb of crucifying and the noun ṣulb in the sense of the back.
4. Qur’anic uses concerning the body and descent
أَصْلَابِكُمْ: sons from your own line
Among the marriage provisions in Al-Nisāʾ 4:23, the Qur’an mentions the wives of sons who are from a person’s own aṣlāb.
حُرِّمَتْ عَلَيْكُمْ أُمَّهَاتُكُمْ وَبَنَاتُكُمْ وَأَخَوَاتُكُمْ وَعَمَّاتُكُمْ وَخَالَاتُكُمْ وَبَنَاتُ الْأَخِ وَبَنَاتُ الْأُخْتِ وَأُمَّهَاتُكُمُ اللَّاتِي أَرْضَعْنَكُمْ وَأَخَوَاتُكُمْ مِنَ الرَّضَاعَةِ وَأُمَّهَاتُ نِسَائِكُمْ وَرَبَائِبُكُمُ اللَّاتِي فِي حُجُورِكُمْ مِنْ نِسَائِكُمُ اللَّاتِي دَخَلْتُمْ بِهِنَّ فَإِنْ لَمْ تَكُونُوا دَخَلْتُمْ بِهِنَّ فَلَا جُنَاحَ عَلَيْكُمْ وَحَلَائِلُ أَبْنَائِكُمُ الَّذِينَ مِنْ أَصْلَابِكُمْ وَأَنْ تَجْمَعُوا بَيْنَ الْأُخْتَيْنِ إِلَّا مَا قَدْ سَلَفَ إِنَّ اللَّهَ كَانَ غَفُورًا رَحِيمًا
ḥurrimat ʿalaykum ummahātukum wa-banātukum wa-akhawātukum wa-ʿammātukum wa-khālātukum wa-banātu al-akhi wa-banātu al-ukhti wa-ummahātukumu al-lātī arḍaʿnakum wa-akhawātukum mina al-raḍāʿati wa-ummahātu nisāʾikum wa-rabāʾibukumu al-lātī fī ḥujūrikum min nisāʾikumu al-lātī dakhaltum bihinna fa-in lam takūnū dakhaltum bihinna fa-lā junāḥa ʿalaykum wa-ḥalāʾilu abnāʾikumu al-ladhīna min aṣlābikum wa-an tajmaʿū bayna al-ukhtayni illā mā qad salafa inna allāha kāna ghafūran raḥīman
“Forbidden to you are your mothers, your daughters, your sisters, your paternal aunts, your maternal aunts, your brothers’ daughters and your sisters’ daughters, your mothers who nursed you, your sisters through nursing, your wives’ mothers, and your stepdaughters in your care, born of wives with whom you have consummated marriage; if you have not consummated marriage with them, there is no blame upon you; and the wives of your sons from your own line, and joining two sisters in marriage at the same time, except what has already passed. Indeed, The God is forgiving and merciful.”
Al-Nisāʾ 4:23
The expression أَبْنَائِكُمُ الَّذِينَ مِنْ أَصْلَابِكُمْ is significant here.
أَصْلَاب is the plural of صُلْب. Within this expression, it refers to descent.
It means sons who truly descend from you, rather than anyone simply given the title of son.
The distinction becomes clearer alongside Al-Aḥzāb 33:4 and Al-Aḥzāb 33:5, where the Qur’an distinguishes actual children from those called adopted sons.
Consequently, مِنْ أَصْلَابِكُمْ in Al-Nisāʾ 4:23 is an expression of descent. It identifies an actual genealogical relationship; it does not offer an anatomical explanation of where reproductive cells form or how the reproductive system is structured.
This matters especially when comparing Al-Ṭāriq 86:7, where the same noun ṣulb occurs in a different construction.
الصُّلْبِ وَالتَّرَائِبِ: ṣulb alongside tarāʾib
In Al-Ṭāriq, after calling the human being to consider the origin of his creation, the Qur’an says:
فَلْيَنْظُرِ الْإِنْسَانُ مِمَّ خُلِقَ
fa-l-yanẓuri al-insānu mimma khuliqa
“So let the human being consider from what he was created.”
Al-Ṭāriq 86:5
خُلِقَ مِنْ مَاءٍ دَافِقٍ
khuliqa min māʾin dāfiqin
“He was created from gushing water.”
Al-Ṭāriq 86:6
يَخْرُجُ مِنْ بَيْنِ الصُّلْبِ وَالتَّرَائِبِ
yakhruju min bayni al-ṣulbi wa-al-tarāʾibi
“Which comes out from between the ṣulb and the tarāʾib.”
Al-Ṭāriq 86:7
Here, الصُّلْب is a definite singular noun in the construction مِنْ بَيْنِ.
Lexically, ṣulb refers to the backbone or vertebrate region of the back. Classical dictionaries record this meaning clearly, independently of modern anatomical debates.
التَّرَائِب belongs to another root and requires separate study. Arabic usages associate it with bones or regions at the front of the upper body, especially the chest. Classical sources differ over its precise limits and its relation to the male or female body.
Some identify it as the chest region where a necklace rests; others refer to bones at the front of the chest; and some interpretations of this verse associate ṣulb with the man and tarāʾib with the woman.
These differences show why tarāʾib should not be restricted to one particular organ without independent investigation.
Al-Ṭabarī: differing transmitted interpretations of tarāʾib
Does ṣulb here mean the back?
Lexically, yes. The established meaning of ṣulb in this construction is the bony region of the back.
That meaning alone, however, does not establish that the Qur’an specifies where the liquid is produced, stored, or the precise route by which it emerges.
The verse speaks of الصُّلْبِ وَالتَّرَائِبِ in conjunction with مِنْ بَيْنِ. Understanding how these two regions relate to يَخْرُجُ requires examining the complete sentence.
Al-Ṭāriq 86:6 also mentions مَاءٍ دَافِقٍ. This water is described as gushing, but dāfiq itself does not mean sperm or a particular substance defined in a laboratory.
Studying these verses must therefore distinguish four questions: the meaning of ṣulb, the meaning of tarāʾib, the referent of the unexpressed subject of yakhruju, and the function of min bayn within the sentence.
None of these four questions can be resolved solely by invoking the root Ṣ L B.
Does ṣulb mean nuṭfah or semen?
No. Ṣulb in its lexical sense does not name nuṭfah or semen.
Arabic can use the word in an expression such as “a child from the father’s ṣulb” because of descent and the conception of genealogical origin. This figurative or genealogical use, however, does not remove its fundamental bodily meaning.
Descent is clear from the context of Al-Nisāʾ 4:23. In Al-Ṭāriq 86:7, the word occurs in a sentence concerning the origin of human creation.
The entire genealogical sense of Al-Nisāʾ cannot therefore simply be transferred to Al-Ṭāriq without evidence; nor can Al-Ṭāriq make aṣlābikum in Al-Nisāʾ into a technical anatomical term.
These verses’ role in Al-Ṭāriq’s argument
After speaking about human creation, Al-Ṭāriq 86:8 speaks of The God’s power to bring the human being back.
Al-Ṭāriq 86:9 also concerns the disclosure of secrets and hidden matters.
This sequence places the verses about the origin of human creation within a larger argument about The God’s power and the human being’s return.
The broader purpose should not cause the meanings of individual words to be overlooked. The passage makes an actual statement about the origin of creation, and that statement requires close linguistic examination.
Conversely, establishing agreement with a scientific theory should not lead to transferring the recognized meaning of ṣulb to another organ without evidence.
Interpretation should begin with language, rather than with a conclusion the researcher has already decided to reach.
5. Crucifying human beings in the Qur’an
The other branch of Qur’anic usage concerns punishment and fastening or suspending a person on a structure.
This use occurs through both the Form I verb صَلَبَ and the Form II verb صَلَّبَ.
Crucifying in these contexts does not merely mean making the body hard. It denotes a recognized punitive and torturous act that can involve fastening, suspending, and publicly exposing a person.
A. Joseph’s story: crucifixion and exposure to birds
In Surah Yūsuf, when two prisoners ask Joseph about their dreams, he answers:
يَا صَاحِبَيِ السِّجْنِ أَمَّا أَحَدُكُمَا فَيَسْقِي رَبَّهُ خَمْرًا وَأَمَّا الْآخَرُ فَيُصْلَبُ فَتَأْكُلُ الطَّيْرُ مِنْ رَأْسِهِ قُضِيَ الْأَمْرُ الَّذِي فِيهِ تَسْتَفْتِيَانِ
yā ṣāḥibayi al-sijni ammā aḥadukumā fa-yasqī rabbahu khamran wa-ammā al-ākharu fa-yuṣlabu fa-taʾkulu al-ṭayru min raʾsihi quḍiya al-amru al-ladhī fīhi tastaftiyāni
“O my two prison companions, one of you will serve wine to his master; the other will be crucified, and birds will eat from his head. The matter about which you seek my judgment has been decided.”
Yūsuf 12:41
فَيُصْلَبُ is an imperfect passive verb of Form I.
The form indicates that the person undergoes crucifixion, while the sentence does not name the agent performing it.
The continuation فَتَأْكُلُ الطَّيْرُ مِنْ رَأْسِهِ indicates that the person is placed where birds can reach his head.
This is consistent with suspending or fastening the person in an exposed, elevated place.
Nevertheless, the verse does not explicitly explain whether he is killed before suspension or dies during crucifixion.
Neither procedure should therefore be treated as certain solely from yuṣlabu.
Nor does the verse establish that the structure necessarily had the familiar Christian cross shape. It mentions crucifixion without specifying the number of timbers, the structure’s shape, or precisely how the body is attached.
B. Pharaoh’s threat: cutting off limbs and crucifying
In Moses’ story, Pharaoh threatens the magicians after they come to believe.
Al-Aʿrāf says:
لَأُقَطِّعَنَّ أَيْدِيَكُمْ وَأَرْجُلَكُمْ مِنْ خِلَافٍ ثُمَّ لَأُصَلِّبَنَّكُمْ أَجْمَعِينَ
la-uqaṭṭiʿanna aydiyakum wa-arjulakum min khilāfin thumma la-uṣallibannakum ajmaʿīna
“I will certainly cut off your hands and feet on opposite sides; then I will crucify you all.”
Al-Aʿrāf 7:124
لَأُصَلِّبَنَّكُمْ is Form II, accompanied by the emphatic lām and the heavy emphatic nūn.
The construction expresses Pharaoh’s threat with strong emphasis.
ثُمَّ also separates cutting off limbs from crucifying. Pharaoh threatens two successive actions: first amputation, then crucifixion.
Al-Shuʿarāʾ 26:49 repeats the threat in a similar construction, but uses wa rather than thumma between the two actions.
This difference should be preserved. Thumma highlights sequence, whereas wa in that construction does not itself explicitly indicate the same ordering.
In Ṭā Hā, Pharaoh also says:
قَالَ آمَنْتُمْ لَهُ قَبْلَ أَنْ آذَنَ لَكُمْ إِنَّهُ لَكَبِيرُكُمُ الَّذِي عَلَّمَكُمُ السِّحْرَ فَلَأُقَطِّعَنَّ أَيْدِيَكُمْ وَأَرْجُلَكُمْ مِنْ خِلَافٍ وَلَأُصَلِّبَنَّكُمْ فِي جُذُوعِ النَّخْلِ وَلَتَعْلَمُنَّ أَيُّنَا أَشَدُّ عَذَابًا وَأَبْقَى
qāla āmantum lahu qabla an ādhana lakum innahu la-kabīrukumu al-ladhī ʿallamakumu al-siḥra fa-la-uqaṭṭiʿanna aydiyakum wa-arjulakum min khilāfin wa-la-uṣallibannakum fī judhūʿi al-nakhli wa-la-taʿlamunna ayyunā ashaddu ʿadhāban wa-abqā
“He said: Did you believe him before I gave you permission? He is surely your chief who taught you magic. I will certainly cut off your hands and feet on opposite sides, and I will crucify you on the trunks of palm trees. You will surely know which of us is harsher in punishment and more enduring.”
Ṭā Hā 20:71
فِي جُذُوعِ النَّخْلِ identifies the location or structure used for crucifixion.
جُذُوع is the plural of جِذْع, meaning tree trunks, while al-nakhl denotes date palms.
Here, the Qur’an therefore explicitly speaks of crucifying on palm trunks.
Why فِي جُذُوعِ النَّخْلِ?
The preposition fī ordinarily expresses being inside something or within its bounds. Nevertheless, an Arabic verb’s spatial relationship expressed through a preposition does not always involve a body enclosed in a space.
In this verse, fī judhūʿ al-nakhl can express the person’s placement and firm attachment on palm trunks.
Classical explanations sometimes understand this fī as ʿalā, “on.” Another explanation is that fī highlights the closeness of attachment and fixed placement on the trunk.
The preposition fī itself, however, does not establish that the person’s body was inserted inside the tree trunk.
“On palm trunks” is natural in translation and conveys the sentence’s spatial sense, while the distinction in the Arabic preposition merits grammatical discussion.
Does crucifying always mean execution?
In Pharaoh’s threat, crucifixion involves torture and severe punishment. The verb itself does not, however, specify the precise manner or timing of death.
In one use, crucifixion may be the means of killing; in another, someone may be suspended after being killed; elsewhere, it may serve as torture and exposure to death.
These differences matter historically and legally, but the root’s bare meaning cannot establish one procedure for every occurrence.
Pharaoh’s story also shows the act functioning within political power, threats, and intimidation. He speaks of punishing those who believed in Moses against his wishes.
Crucifixion in this story is therefore an oppressive ruler’s act and instrument of intimidation. The mere appearance of an act in a Qur’anic narrative should not be taken as its moral or legislative approval.
C. وَمَا صَلَبُوهُ: denying the crucifixion of Jesus
Al-Nisāʾ says:
وَقَوْلِهِمْ إِنَّا قَتَلْنَا الْمَسِيحَ عِيسَى ابْنَ مَرْيَمَ رَسُولَ اللَّهِ وَمَا قَتَلُوهُ وَمَا صَلَبُوهُ وَلَٰكِنْ شُبِّهَ لَهُمْ وَإِنَّ الَّذِينَ اخْتَلَفُوا فِيهِ لَفِي شَكٍّ مِنْهُ مَا لَهُمْ بِهِ مِنْ عِلْمٍ إِلَّا اتِّبَاعَ الظَّنِّ وَمَا قَتَلُوهُ يَقِينًا
wa-qawlihim innā qatalnā al-masīḥa ʿīsā ibna maryama rasūla allāhi wa-mā qatalūhu wa-mā ṣalabūhu wa-lākin shubbiha lahum wa-inna al-ladhīna ikhtalafū fīhi la-fī shakkin minhu mā lahum bihi min ʿilmin illā ittibāʿa al-ẓanni wa-mā qatalūhu yaqīnan
“And because of their saying, ‘We killed the Messiah, Jesus son of Mary, the messenger of The God’—yet they neither killed him nor crucified him, but the matter was made unclear to them. Those who differ about him are surely in doubt about it; they have no knowledge of it, only the following of conjecture, and they certainly did not kill him.”
Al-Nisāʾ 4:157
The verse uses two distinct verbs:
قَتَلُوهُ, from Q T L, means “they killed him.”
صَلَبُوهُ, from Ṣ L B, means “they crucified him.”
The Qur’an negates both.
This distinction matters: within the verse’s wording, killing and crucifying are distinct concepts, although they may accompany one another in historical events.
If the two words were fully synonymous, the distinction in the sentence would lose its force. Qatl denotes taking life, whereas ṣalb refers to a particular manner of fastening or suspending someone for punishment.
Distinguishing the verbs does not mean that crucifixion never causes death. Their meanings differ; the two events can still coincide.
وَلَكِنْ شُبِّهَ لَهُمْ and the limits of lexical research
After negating killing and crucifixion, the Qur’an says: وَلَكِنْ شُبِّهَ لَهُمْ.
This expression comes from SH B H and concerns the matter becoming unclear to them.
Methodologically, two questions should be distinguished: the clear meaning of ṣalabūhu and the nature of the disputed event concerning Jesus.
Ṣalabūhu means “they crucified him.” The verb itself, however, does not identify who was arrested, who was placed on a structure, or what event caused the confusion.
Nor does the verse name another person crucified in Jesus’ place. A substitution narrative or historical details absent from the verse should therefore not be inserted into the lexical explanation of ṣalb.
Here, the Qur’an rejects the claimants’ assertion that they killed and crucified Jesus and emphasizes the disputants’ lack of certain knowledge.
The verse’s own interpretation should examine this theme fully. For the root study, the necessary conclusion is clear: ṣalb names a particular act that the Qur’an denies the claimants performed upon Jesus.
D. يُصَلَّبُوا in Al-Māʾidah: legal and punitive usage
Al-Māʾidah says:
إِنَّمَا جَزَاءُ الَّذِينَ يُحَارِبُونَ اللَّهَ وَرَسُولَهُ وَيَسْعَوْنَ فِي الْأَرْضِ فَسَادًا أَنْ يُقَتَّلُوا أَوْ يُصَلَّبُوا أَوْ تُقَطَّعَ أَيْدِيهِمْ وَأَرْجُلُهُمْ مِنْ خِلَافٍ أَوْ يُنْفَوْا مِنَ الْأَرْضِ ذَٰلِكَ لَهُمْ خِزْيٌ فِي الدُّنْيَا وَلَهُمْ فِي الْآخِرَةِ عَذَابٌ عَظِيمٌ
innamā jazāʾu al-ladhīna yuḥāribūna allāha wa-rasūlahu wa-yasʿawna fī al-arḍi fasādan an yuqattalū aw yuṣallabū aw tuqaṭṭaʿa aydīhim wa-arjuluhum min khilāfin aw yunfaw mina al-arḍi dhālika lahum khizyun fī al-dunyā wa-lahum fī al-ākhirati ʿadhābun ʿaẓīmun
“The recompense of those who wage war against The God and His messenger and strive for corruption in the land is only that they be killed or crucified, or have their hands and feet cut off on opposite sides, or be banished from the land. That is disgrace for them in this world, and in the Hereafter they will have a great punishment.”
Al-Māʾidah 5:33
يُصَلَّبُوا is a Form II imperfect passive verb, appearing alongside several other punishments.
The difference from Pharaoh’s story is clear.
In Pharaoh’s story, crucifixion forms part of a ruler’s threat intended to oppose the magicians’ belief.
In Al-Māʾidah, it occurs within a statement of recompense for those who wage war against The God and His messenger and strive for corruption in the land.
Both uses refer to crucifying, but their legal and moral positions emerge from their contexts.
Distinguishing يُقَتَّلُوا and يُصَلَّبُوا
The conjunction أَوْ separates these two verbs in the verse.
يُقَتَّلُوا, from Q T L, concerns being killed.
يُصَلَّبُوا, from Ṣ L B, concerns being crucified.
The wording therefore distinguishes two descriptions of punishment.
This coordination alone, however, cannot establish every procedural detail: the circumstances of crucifixion, its relationship to killing, and how the verse’s alternatives are selected are separate legal questions.
Nor would turning any of these punishments into a general rule for every intellectual or religious opponent fit the verse’s explicit subject. The described group is characterized by يُحَارِبُونَ اللَّهَ وَرَسُولَهُ and يَسْعَوْنَ فِي الْأَرْضِ فَسَادًا.
These qualifications should not be omitted when citing yuṣallabū.
The next verse, Al-Māʾidah 5:34, also states an exception for those who repent before being apprehended. This continuation shows why a legal study must examine more than one word or part of a verse.
Lexically, the secure conclusion is that ṣalb in Al-Māʾidah 5:33 names an actual punishment, rather than metaphorically meaning strictness or making the body firm.
6. Crucifying and the cross
In punitive use, ṣalb concerns placing a person on wood or another fixed structure.
The act should nevertheless be distinguished from the structure’s shape.
Arabic also uses ṣalīb for the familiar cross as a sign or structure. The noun ṣalīb itself, however, does not occur in the Qur’an; the family’s punitive uses there are expressed through verbs.
Pharaoh’s story explicitly names palm trunks.
Joseph’s story mentions crucifixion and birds eating from the person’s head, without specifying the structure’s shape.
Al-Nisāʾ 4:157 negates the act of crucifixion but does not specify the wood or implement.
The central meaning of this use can therefore be conveyed as “crucifying” or “fastening and suspending someone on wood or a structure for punishment.”
A fixed geometry, a particular number of timbers, or a uniform procedure should not be assumed for every Qur’anic occurrence.
The Persian word for cross today usually evokes a particular shape. That image helps explain some historical uses, but should not replace the Arabic verb’s entire semantic field.
A Persian expression meaning “hanging on a gibbet” may therefore serve as an explanatory equivalent in some contexts. It does not always convey all the features of ṣalb, since Persian readers may understand hanging as suspension by a rope around the neck.
For Qur’anic translation, “crucifying” is the more familiar and precise equivalent. The structure’s shape can be discussed in the reflection.
7. Form I and Form II
Both Form I and Form II of this root are used in the Qur’an for crucifying a human being.
صَلَبُوهُ in Al-Nisāʾ 4:157 is Form I.
فَيُصْلَبُ in Yūsuf 12:41 is likewise Form I, in the passive voice.
لَأُصَلِّبَنَّكُمْ in Al-Aʿrāf 7:124, Ṭā Hā 20:71, and Al-Shuʿarāʾ 26:49 is Form II.
يُصَلَّبُوا in Al-Māʾidah 5:33 is also Form II, in the passive voice.
In some Arabic usages, Form II may indicate intensity, repetition, or extension of an act. This is not an absolute rule for every occurrence.
In this root, both forms denote the recognized act of crucifixion. It should not be concluded that Form I always describes a milder punishment and Form II a more severe one.
Alongside the verb itself, Pharaoh’s emphatic threats in Al-Aʿrāf 7:124 and Ṭā Hā 20:71 are marked by the emphatic lām, emphatic nūn, and stated cutting off of limbs.
Likewise, the passive يُصَلَّبُوا in Al-Māʾidah 5:33 does not change the act’s nature. The construction emphasizes punishment undergone by people, rather than naming its executor.
Both ṣalaba and ṣallaba can be translated “crucified,” unless the context requires a particular distinction.
9. Challenges in understanding and translation
Does ṣulb mean the backbone or hardness?
Both meanings exist in Arabic, but their uses differ.
When الصُّلْب names a bodily part, “backbone” or “the bony region of the back” is appropriate.
When the adjective صُلْب describes a physical object such as stone or ground, hardness and firmness are intended.
The meanings are related, but should not replace one another in translation.
Does aṣlāb mean children?
Lexically, أَصْلَاب is the plural of صُلْب, rather than a plural meaning children.
Within مِنْ أَصْلَابِكُمْ, however, established usage and the genealogical context point to children who actually descend from a person.
Al-Nisāʾ 4:23 can therefore naturally be translated “from your own line.”
A dictionary should not, however, equate the independent meaning of aṣlāb with children. That sense emerges from the expression and its genealogical use.
Does the cross always have one particular shape?
No. The noun for a cross in Arabic and other languages may evoke recognizable shapes, but the Qur’anic verb of crucifying does not always specify the implement’s exact form.
Ṭā Hā 20:71 names palm trunks; the other verses do not provide that description.
Translation should therefore convey the act itself. The structure’s shape should be explained only where the wording supplies the necessary evidence.
Does every mention of crucifixion express a divinely approved ruling?
No. The Qur’an uses the verb in different contexts.
In Pharaoh’s story, it forms part of an oppressive ruler’s threat.
In Joseph’s story, it forms part of a statement about a prisoner’s fate.
In Al-Nisāʾ, the subject is a claim about Jesus’ crucifixion that the Qur’an rejects.
In Al-Māʾidah, the subject is punishment in a context of warfare and corruption in the land.
An act’s legal and moral value therefore cannot be derived from the root itself. The same act may appear as an oppressive threat in one context and within a ruling concerning a particular crime in another.
These differences follow from the verses’ subjects and constructions, rather than from arbitrarily changing ṣalb’s meaning.
10. Translation proposals for Forqan
For physical صَلُبَ, “became hard,” “became solid,” or “became firm” is appropriate.
For صَلَابَة, suitable equivalents are “hardness,” “solidity,” and “firmness.”
For bodily صُلْب, “backbone” or “vertebral column” is more precise. “Back” can also be natural depending on context, but broadens the word’s bodily reference.
In Al-Nisāʾ 4:23, the principal proposal for مِنْ أَصْلَابِكُمْ is “from your own line.” This conveys the expression’s genealogical sense without additional anatomical explanation.
In Al-Ṭāriq 86:7, “backbone” is preferable for الصُّلْب. The meaning of tarāʾib and its relationship to ṣulb require separate discussion. A direct translation should not replace ṣulb with the place of semen production or the reproductive organs.
For punitive صَلَبَ, “crucified” is the principal equivalent.
In Al-Nisāʾ 4:157, وَمَا صَلَبُوهُ can be translated “and they did not crucify him.”
In Yūsuf 12:41, فَيُصْلَبُ means “then he will be crucified.”
In Ṭā Hā 20:71, وَلَأُصَلِّبَنَّكُمْ فِي جُذُوعِ النَّخْلِ can be translated “and I will certainly crucify you on the trunks of palm trees.”
In Al-Māʾidah 5:33, أَوْ يُصَلَّبُوا means “or be crucified.” The word should not itself become “be killed,” since a separate verb in the same verse expresses killing.
“Fastening to a gibbet” and “suspending on wood” can serve as explanatory equivalents. For the base translation, however, “crucifying” is clearer. The reflection is the appropriate place to explain the structure’s form and the procedure.
11. Conclusion
Ṣ L B has several semantic branches in Arabic. Its familiar branch of hardness and firmness appears in the name of the bony back and descriptions of hard objects. Classical sources also record another branch concerning bone fat and related expressions.
In the Qur’an, the root occurs in two distinct fields.
First, ṣulb and aṣlāb concern the backbone and descent. In Al-Nisāʾ 4:23, aṣlābikum occurs in an expression identifying sons from a person’s actual line. In Al-Ṭāriq 86:7, al-ṣulb occurs in a construction concerning the origin of human creation; its bodily meaning should remain distinct from the separate discussion of tarāʾib.
Second, the verbs ṣalaba and ṣallaba concern punishment, torture, and crucifying human beings. Joseph’s story, Pharaoh’s threat, the denial of Jesus’ crucifixion, and the punishment described in Al-Māʾidah all belong to this field.
Ṣalb here does not merely mean making hard or firm. It refers to a recognized act in which someone is fastened or suspended on wood or a structure for punishment.
The verb nevertheless does not always specify the time of death, the structure’s shape, the number of timbers, or the exact procedure. Context or independent evidence must establish those details.
The root cannot be reduced to just one simple meaning: ṣulb belongs to the field of hardness and the backbone, while punitive ṣalaba means crucifying a human being. These meanings are lexically related, but each requires precise, distinct understanding in its own Qur’anic use.