Qur’anic Root A S N

1. The Qur’anic form and semantic core

The root A S N occurs only once in the Qur’an, in the form آسِنٍ (āsinin):

Muḥammad 47:15 — مَاءٍ غَيْرِ آسِنٍ (māʾin ghayri āsinin)

In the widely used reading transmitted by Ḥafṣ, آسِن (āsin) is an active participle on the pattern فاعِل (fāʿil), describing something that has entered the state expressed by the root. Semantically, the description concerns مَاءٍ (māʾin), “water.” Syntactically, āsinin itself is the genitive complement of غَيْرِ (ghayri); the whole phrase ghayri āsinin describes the water.

Arabic records the verbs أَسَنَ (asana) and أَسِنَ (asina) for unfavorable change in water. Recorded verbal nouns include أَسْن (asn), أَسَن (asan), and أُسُون (usūn).

The form آسِن (āsin) describes water that has deteriorated; some sources also record آسَان (āsān) as its plural.

Outside the Qur’an, تَأَسَّنَ الْمَاءُ (taʾassana al-māʾu) likewise means that water changed and lost its former quality.

In Ibn Kathīr’s reading, the shorter form أَسِنٍ (asinin) is read in place of آسِنٍ (āsinin). Both belong to the semantic field of unfavorable change in water. Some grammatical explanations distinguish them in terms of present and future reference. That analysis should not be made the certain meaning of every use, nor should their different structures be taken to establish two entirely different kinds of water.

The semantic core of the Qur’anic branch may be expressed as follows:

An unfavorable change in quality, especially in water, diminishing its freshness and pleasantness and giving it an unpleasant smell or taste.

Change is central to this definition, but not every change in water is intended. What distinguishes āsin from a general description such as “changed” is the unfavorable direction of the change.

2. Early Arabic usage: stale water, unpleasant smell, and change

أَسَنَ الْمَاءُ (asana al-māʾu): water whose quality has changed

In early Arabic usage, أَسَنَ الْمَاءُ (asana al-māʾu) described water that underwent an unfavorable change through standing or other causes.

Older explanations sometimes emphasize a change in smell, while others also mention changes in taste and overall condition.

The expression مَاءٌ آسِنٌ (māʾun āsinun) was especially associated with water that had lost its original pleasantness through deterioration.

For people living in dry regions, the distinction between fresh water and stale water had practical importance. Water in wells, cisterns, and pools was not always equally fresh or pleasant. A person might smell water before drinking or judge its suitability by observing its condition.

In this setting, أَسَن (asan) was among the words used to describe an unfavorable change in water.

This does not mean that every body of still water is āsin. Standing may contribute to deterioration, but āsin names an unfavorable condition, rather than merely describing a lack of movement.

Nor does āsin name a particular disease or contaminating substance. Early Arabic used the word to describe the perceptible condition of water, rather than identifying its microbial or chemical cause.

Is āsin water always undrinkable?

Older lexical sources give two descriptions of āsin water.

In one, the water has changed but remains drinkable. In another, its smell has become so unpleasant that no one drinks it.

These descriptions may reflect different degrees of deterioration. However, differing lexical explanations alone do not establish one fixed degree of spoilage.

Water might have acquired a slight stale smell and still be drunk. Other water might be so foul and unpleasant that drinking it becomes difficult.

Being undrinkable is therefore not a necessary condition of every use of āsin. What the two descriptions share is an unfavorable change in the water’s quality.

Consequently, “poisonous water” or “poisoned water” is not an accurate translation of مَاءٌ آسِنٌ (māʾun āsinun): poisoning is not a meaning supplied by the root itself.

“Stale, foul-smelling water” or “putrid water” is closer to its established semantic field.

أَسِنَ الرَّجُلُ (asina al-rajulu): dizziness or fainting from foul air

Another branch of this word family describes a human condition.

أَسِنَ الرَّجُلُ (asina al-rajulu) was said of someone who became dizzy or fainted from foul air or an unpleasant smell, especially on descending into a well.

This use is understandable in the context of drawing water from wells. Someone entering a well to bring up water might encounter bad air and lose balance or consciousness.

A line attributed to Zuhayr ibn Abī Sulmā, a poet of the pre-Islamic period, reads as follows. This transmission alone does not establish the precise date of the line:

يُغَادِرُ الْقِرْنَ مُصْفَرًّا أَنَامِلُهُ
يَمِيدُ فِي الرُّمْحِ مَيْدَ الْمَائِحِ الْأَسِنِ

yughādiru al-qirna muṣfarran anāmiluhu / yamīdu fī al-rumḥi mayda al-māʾiḥi al-asini

“He leaves his opponent with fingers turned pale, swaying on the spear as a water-drawer sways when overcome by dizziness in a well.”

الْمَائِح (al-māʾiḥ) is someone who descends into a well to draw water. In one reading of this line, الْأَسِن (al-asin) describes a person overcome by dizziness and weakness.

The witness shows that the word was known for more than deteriorated water: it could also describe a person affected by foul air.

The wording is not transmitted uniformly. Some versions have الْوَسِن (al-wasin) instead of الْأَسِن (al-asin), and variants of the verbs are also recorded. This witness should therefore not be treated on its own as conclusive proof of one particular pre-Qur’anic form. Lexical sources also record أَسِنَ (asina), meaning to become dizzy or faint, independently of this line.

There is an intelligible semantic connection between foul-smelling water and someone becoming dizzy from foul air. This does not mean that Qur’anic āsin directly refers to fainting or dizziness.

In Muḥammad 47:15, the description concerns water, not a person. The relevant meaning is therefore the unfavorable deterioration of water.

تَأَسَّنَ (taʾassana): a change in a pledge or relationship

Some Arabic usages record تَأَسَّنَ (taʾassana) in connection with pledges and friendship.

Expressions such as تَأَسَّنَ عَهْدُهُ وَوُدُّهُ (taʾassana ʿahduhu wa-wudduhu) refer to a change in a bond or relationship previously established between people.

This may extend the meaning of change from a material condition to a human relationship. Relationships, too, can be described as changing or cooling.

The historical standing and transmitted wording of all uses of taʾassana are not uniform. The verb is also reported for becoming ill. The expression تَأَسَّنَ عَلَيَّ (taʾassana ʿalayya) is explained as “he offered an excuse and delayed”; the same expression is also transmitted as تَأَسَّرَ عَلَيَّ (taʾassara ʿalayya). Al-Azharī regarded the version ending in rāʾ as correct. This disagreement particularly concerns the latter expression; it does not negate the clear use concerning a change in water.

All these usages should therefore not be joined into one certain historical branch without examination.

For the Qur’anic use, the meaning of unfavorable change in water is clear. There is no need to construct a new definition through the meanings concerning friendship or pledges.

3. Another branch: strands, bonds, and آسَان (āsān)

Some older dictionaries record another branch of the A S N family concerning ropes, strands, and bonds.

In this use, آسَان (āsān) refers to strands or constituent parts of a rope. أَسِينَة (asīnah) is also recorded for one of the strands braided together to make a rope or strap.

Arabic also extends this image figuratively to bonds between people, speaking of the strands of a relationship being severed.

This branch differs semantically from putrid water.

Some sources record آسَان (āsān) as a plural of آسِن (āsin), describing deteriorated waters; a similar form is also recorded for strands of rope.

Similarity in written form does not itself prove that these usages developed from one historical meaning.

Some sources even include words for remnants of fat or worn cloth under this entry. The status of some forms is disputed, and replacement of initial ʿayn by hamza has been proposed.

All these branches should therefore not be forced into an image of “spoiled water” or “a rotten strand.”

The two principal recorded fields may be kept distinct: unfavorable change, to which the Qur’anic use belongs, and strands or bonds, recorded in Arabic but not used in the Qur’an.

4. مَاءٍ غَيْرِ آسِنٍ (māʾin ghayri āsinin): water in Paradise that does not go foul

The root’s sole Qur’anic occurrence is in Surah Muḥammad:

مَّثَلُ الْجَنَّةِ الَّتِي وُعِدَ الْمُتَّقُونَ فِيهَا أَنْهَارٌ مِنْ مَاءٍ غَيْرِ آسِنٍ وَأَنْهَارٌ مِنْ لَبَنٍ لَمْ يَتَغَيَّرْ طَعْمُهُ وَأَنْهَارٌ مِنْ خَمْرٍ لَذَّةٍ لِلشَّارِبِينَ وَأَنْهَارٌ مِنْ عَسَلٍ مُصَفًّى وَلَهُمْ فِيهَا مِنْ كُلِّ الثَّمَرَاتِ وَمَغْفِرَةٌ مِنْ رَبِّهِمْ كَمَنْ هُوَ خَالِدٌ فِي النَّارِ وَسُقُوا مَاءً حَمِيمًا فَقَطَّعَ أَمْعَاءَهُمْ

mathalu al-jannati allatī wuʿida al-muttaqūna fīhā anhārun min māʾin ghayri āsinin wa-anhārun min labanin lam yataghayyar ṭaʿmuhu wa-anhārun min khamrin ladhdhatin li-l-shāribīna wa-anhārun min ʿasalin muṣaffan wa-lahum fīhā min kulli al-thamarāti wa-maghfiratun min rabbihim ka-man huwa khālidun fī al-nāri wa-suqū māʾan ḥamīman fa-qaṭṭaʿa amʿāʾahum

“The description of the Garden promised to the God-conscious is this: in it are rivers of water that has not gone foul or acquired an unpleasant smell, rivers of milk whose taste has not changed, rivers of wine delightful to those who drink, and rivers of purified honey. There they will have every kind of fruit and forgiveness from their Lord. Are these like someone who remains in the Fire, where they are given boiling water to drink that tears their intestines apart?”

Muḥammad 47:15

The ayah mentions several kinds of drink, giving each a description that identifies an aspect of its quality.

For water it uses غَيْرِ آسِنٍ (ghayri āsinin): water that has not undergone unfavorable change or become putrid.

For milk it uses لَمْ يَتَغَيَّرْ طَعْمُهُ (lam yataghayyar ṭaʿmuhu): its taste has not changed.

For wine it uses لَذَّةٍ لِلشَّارِبِينَ (ladhdhatin li-l-shāribīna): delightful to those who drink.

For honey it uses مُصَفًّى (muṣaffan): purified or filtered.

These four descriptions share a setting, but they do not have the same meaning.

Why does the water receive the description غَيْرِ آسِنٍ (ghayri āsinin)?

Water is among the most essential human needs. Yet water found in nature is not always alike. It may be fresh and pleasant, or unfavorable conditions may give it an unpleasant smell or taste.

آسِن (āsin) refers to this unfavorable change.

In describing Paradise, the Qur’an does more than state that water exists there: it also describes its quality. The promised water is not putrid or foul-smelling.

For an Arabic-speaking audience familiar with the difference between fresh and stale water, this is a tangible description.

Nevertheless, غَيْرِ آسِنٍ (ghayri āsinin) should not be taken to mean that the ayah discusses microbial mechanisms, chemical cycles, or water-treatment methods in Paradise.

The Qur’an describes the water’s quality through a familiar word. Turning this description into a scientific account of the structure of the Hereafter goes beyond the ayah’s own meaning.

Does غَيْرِ آسِنٍ (ghayri āsinin) mean flowing water?

The ayah speaks of أَنْهَارٌ (anhārun), “rivers.”

Flowing is understood from anhārun, rather than from آسِن (āsin).

The lexical use of āsin concerns unfavorable change in water. Not every flowing body of water is necessarily free from contamination or change, just as not every body of still water is necessarily putrid.

Translating أَنْهَارٌ مِنْ مَاءٍ غَيْرِ آسِنٍ (anhārun min māʾin ghayri āsinin) merely as “rivers of flowing water” is therefore insufficient: it omits the meaning of ghayri āsinin.

The presence of rivers is one feature; their water not being foul is another.

Does غَيْرِ آسِنٍ (ghayri āsinin) mean absolutely pure and free of every impurity?

In Arabic, آسِن (āsin) emphasizes unfavorable deterioration in water. This can be related to contamination and spoilage, but it does not encompass every kind of impurity.

Water may contain naturally occurring minerals without being putrid or foul-smelling. Conversely, it may appear clear while being unsuitable for drinking.

Simply negating āsin cannot therefore establish every possible feature of the water, from clarity and purity to composition and temperature.

In the ayah’s context, the water in Paradise receives a clear, positive description in contrast to the unfavorable condition of foul water. Its other features must be learned from other ayahs themselves, rather than from an unsupported expansion of one word’s meaning.

5. The difference between غَيْرِ آسِنٍ (ghayri āsinin) and لَمْ يَتَغَيَّرْ طَعْمُهُ (lam yataghayyar ṭaʿmuhu)

In the same ayah, the Qur’an uses لَمْ يَتَغَيَّرْ طَعْمُهُ (lam yataghayyar ṭaʿmuhu) for milk: “its taste has not changed.”

This juxtaposition helps establish the semantic limits of آسِن (āsin).

تَغَيَّرَ (taghayyara), from GH Y R, means to change. Such change can occur under various conditions and is not inherently limited to spoilage or putrefaction.

آسِن (āsin), in its use concerning water, expresses an unfavorable change apparent especially in smell and taste.

غَيْرِ آسِنٍ (ghayri āsinin) should therefore not be rendered merely “unchanged,” without indicating what kind of change is being negated.

For milk, the Qur’an speaks directly of its taste not changing. For water, it uses a particular word concerning deterioration in its quality.

Both descriptions concern preserving the desirable quality of a drink, but they are not identical.

An accurate translation should therefore not reduce all the ayah’s descriptions to a general phrase such as “pure and wholesome.”

For water, “not gone foul” or “not acquired an unpleasant smell” is appropriate; for milk, “its taste has not changed.”

Each describes something about the drink’s desirable quality, but through a different linguistic expression.

6. Distinctions from related roots

A S N: آسِن (āsin), and A J N: آجِن (ājin)

آجِن (ājin), from A J N, is used in Arabic for water that has changed.

Older explanations sometimes gloss āsin and ājin with each other. Both can refer to water whose quality has changed through standing or other causes.

However, some uses of ājin emphasize a change in taste or color, while some uses of āsin are more closely associated with a change in smell.

This is a tendency, not an absolute distinction without exceptions. Arabic sources can use both words for unfavorable change in water.

آجِن (ājin) does not occur in the Qur’an and should not be counted as a Qur’anic form of A S N.

A S N: آسِن (āsin), and GH Y R: تَغَيَّرَ (taghayyara)

Study of GH Y R

تَغَيَّرَ (taghayyara) concerns change and has a much broader range.

Not every change is deterioration. Something may pass from one state to another without becoming worse in quality.

By contrast, آسِن (āsin), when used of water, concerns an unfavorable change that diminishes its freshness and pleasantness.

The distinction is apparent in Muḥammad 47:15, which uses غَيْرِ آسِنٍ (ghayri āsinin) for water and لَمْ يَتَغَيَّرْ طَعْمُهُ (lam yataghayyar ṭaʿmuhu) for milk.

The general concept of change can thus help explain āsin, but it is not a sufficient definition by itself.

A S N: آسِن (āsin), and K D R: كَدَر (kadar)

Study of K D R (Not yet published)

كَدَر (kadar) concerns cloudiness or turbidity in Arabic and can also describe water.

Turbidity and putrefaction are nevertheless distinct.

Water may become turbid through soil or suspended particles without necessarily acquiring a putrid smell. It may also have an unpleasant smell without showing obvious cloudiness.

Translating آسِن (āsin) as “muddy water” therefore restricts the root’s meaning too narrowly.

“Foul-smelling or putrid water” is more accurate for the Qur’anic use.

A S N: آسِن (āsin), and S N H: يَتَسَنَّهْ (yatasannah)

Study of S N H (Not yet published)

Al-Baqarah 2:259 uses the expression لَمْ يَتَسَنَّهْ (lam yatasannah) concerning food and drink.

In the ayah’s context, the verb concerns food and drink not deteriorating with the passage of time.

It is semantically related to غَيْرِ آسِنٍ (ghayri āsinin), since both expressions are understood in connection with food or drink retaining desirable quality.

However, the Qur’anic morphological index groups يَتَسَنَّهْ (yatasannah) under S N H, rather than A S N.

The two forms should therefore not be treated as derivatives of one root merely because their meanings are close and their letters look similar.

Furthermore, Al-Baqarah 2:259 concerns the passage of time and the preservation of food and drink in a particular event. In Muḥammad 47:15, ghayri āsinin directly describes the water of Paradise.

A S N: آسِن (āsin), and Ḥ M M: حَمِيم (ḥamīm)

Study of Ḥ M M (Not yet published)

The end of Muḥammad 47:15 describes another kind of water: مَاءً حَمِيمًا (māʾan ḥamīman).

In this context, حَمِيم (ḥamīm) refers to intensely hot, boiling water given to the people of the Fire, causing severe internal injury.

This description differs from آسِن (āsin).

آسِن (āsin) concerns unfavorable deterioration or putrefaction in water, whereas حَمِيم (ḥamīm) concerns its intense heat.

The ayah thus describes two very different conditions of water in contrasting scenes: water that has not gone foul among the blessings of Paradise, and scalding, harmful water in the scene of punishment.

This contrast should not lead us to translate ghayri āsinin as “cold water” or ḥamīm as “putrid water.” Each description has its own meaning.

7. Translation choices for Forqan

The principal English equivalents of آسِن (āsin) are “foul,” “putrid,” or “having acquired an unpleasant smell,” especially when the thing described is water.

“Stale water” can be useful in some settings, but is not precise enough on its own: water standing for a time does not necessarily mean that it has gone foul.

“Spoiled water” may also convey the general meaning, but can suggest poisoning or certain undrinkability beyond what the word itself requires.

“Stagnant water” is unsuitable as a direct translation: stagnation concerns the water’s movement, whereas āsin concerns an unfavorable change in quality.

For مَاءٍ غَيْرِ آسِنٍ (māʾin ghayri āsinin) in Muḥammad 47:15, the suggested rendering is:

“Water that has not gone foul or acquired an unpleasant smell.”

This wording makes the root’s meaning clear without adding features such as temperature, absolute clarity, or a mechanism of water treatment.

Where a shorter translation is needed, “water that has not gone foul” is also appropriate.

Within the full ayah, the phrase may be rendered:

“In it are rivers of water that has not gone foul or acquired an unpleasant smell.”

Here, “rivers” translates أَنْهَارٌ (anhārun), while “has not gone foul or acquired an unpleasant smell” translates غَيْرِ آسِنٍ (ghayri āsinin). This preserves each part’s contribution to the sentence.

Non-Qur’anic forms should also be translated according to their use. أَسِنَ (asina), describing someone in a well, may mean “became dizzy” or “fainted.” In connection with a pledge or relationship, تَأَسَّنَ (taʾassana) can be explained as “changed.”

These meanings should not, however, be imported into the translation of āsin when it describes water.

8. Conclusion

In its best-known Arabic use, A S N concerns unfavorable deterioration in water. Water described as آسِن (āsin) has acquired an unpleasant smell or taste and lost its original freshness and pleasantness.

Arabic also records uses concerning dizziness caused by foul air in a well and changes in a pledge or relationship. Another branch concerns strands of rope and bonds. The historical relationship between all these uses is nevertheless uncertain; they should not be explained through an invented common image.

The root occurs only once in the Qur’an, in the form آسِنٍ (āsinin).

Muḥammad 47:15 speaks of rivers containing water described as غَيْرِ آسِنٍ (ghayri āsinin): water that has not gone putrid or undergone unfavorable change.

The expression is related to the descriptions of milk, wine, and honey in the same ayah, but their lexical distinctions should remain clear. The water has not gone foul; the milk’s taste has not changed; the wine is delightful; and the honey is purified.

At the end of the ayah, the water of Paradise that has not gone foul is set against the boiling water of the people of the Fire. Water thus has very different roles in the two scenes, but the meaning of āsin should not be equated with that of ḥamīm.

Forqan’s final definition of A S N:

“In the principal branch represented by the Qur’anic use, an unfavorable change in water’s quality, especially the development of an unpleasant smell and putrefaction that diminish its freshness and pleasantness. In the Qur’an, āsin describes deteriorated, foul water; ghayri āsinin describes water that has not undergone such change. Other recorded lexical uses concern dizziness, changes in relationships, and strands of connection, but should not be transferred to the Qur’anic meaning concerning water without evidence.”