ممنوع من الصرف — Diptotes
Mamʿ min al-ṣarf (ممنوع من الصرف), also called diptote in English grammar terminology, refers to nouns and adjectives that are restricted from full declension. Specifically:
- They never take tanwīn
- They cannot take kasra when majrūr — they take fataḥ instead
The Three States of a Diptote
| State | Normal Triptote | Diptote |
|---|---|---|
| Marfūʿ | ḍamma (ُ) | ḍamma (ُ) |
| Manṣūb | fataḥ (َ) | fataḥ (َ) |
| Majrūr | kasra (ِ) | fataḥ (َ) ← key difference |
When a diptote enters a jarr construction (after a preposition or as muḍāf ilayh), it takes fataḥ instead of kasra.
Female Names as Diptotes
زَينَب (Zaynab) — even after a preposition of jarr:
إِتَّصَلتُ بِزَينَبَ — not بِزَينَبِ
Similarly: آمِنَة، مَريَم، سُعَاد
What Causes a Word to Be a Diptote?
There are multiple causes. Two covered in this session:
1. Additional (Non-Radical) Final Alif
When a word ends in an alif that is NOT the third root letter but was added to the word, it becomes a diptote.
| Word | Final Alif | Status |
|---|---|---|
| تَقوَى (taqwā) | Additional alif (root is و-ق-ي) | Diptote |
| فَتوَى (fatwā) | Additional alif | Diptote |
| فَتَى (fatā) | The alif IS the third radical (wāw in alif form) | Not a diptote |
| أَسنَى | The alif IS the third radical | Not a diptote |
2. Non-Arabic Proper Names
Any name borrowed into Arabic from another language is a diptote — because foreign words are exempt from full Arabic declension:
- مُوسَى (Mūsā) — Hebrew/Aramaic origin
- عِيسَى (ʿĪsā) — likewise
- This rule also applies to Arabic female names: زَينَب، عَائِشَة، آمِنَة، فَاطِمَة
3. Nouns/Names on the Pattern of a Verb
Any noun or name whose form matches the pattern of an Arabic verb is a diptote. Verbs have no case endings, and nouns shaped like verbs inherit this restriction:
- أَحمَد — follows the pattern أَفعَل (the superlative/elative verb pattern)
- Even though it is a proper name, its verb-like pattern makes it mamʿ min al-ṣarf
- When marfūʿ: أَحمَدُ (no tanwīn)
- When majrūr: أَحمَدَ (fataḥ replaces kasra)
Muqaddar Iʿrāb on Alif-Final Diptotes
Words like تَقوَى have an additional complication: since they end in alif — which is a vowel (ḥarf ʿillah) and cannot carry a vowel sign — all iʿrāb marks are muqaddar (implied, assumed in the mind, not written).
So for تَقوَى: - Marfūʿ: the ḍamma is muqaddar on the alif - Manṣūb: the fataḥ is muqaddar on the alif - Majrūr: it is a diptote, so fataḥ replaces kasra — and that fataḥ is also muqaddar on the alif
In all three states, the written form is the same: تَقوَى — the iʿrāb is entirely in the reader's understanding.
Taqwā — Detailed Analysis
تَقوَى is derived from وَقَى (root: و-ق-ي).
- The root letters are: و (1st) + ق (2nd) + و (3rd, originally yāʾ/wāw)
- The visible alif at the end of تَقوَى is additional — it is not any of the three root letters
- Therefore: تَقوَى is a diptote
- When majrūr (e.g. after لِ): takes muqaddar fataḥ — لِلتَّقوَى
Contrast: Alif as Third Radical (Not a Diptote)
Words like فَتَى (young man, root: ف-ت-و) end in alif, but here the alif is the third root letter (the wāw took the alif form). These words are:
- Not diptotes — they are fully declinable
- When majrūr: take muqaddar kasra (not fataḥ)
- The kasra is also muqaddar (hidden on the alif)
| Word | Final Alif | Majrūr Form | Muqaddar Ḥarakah |
|---|---|---|---|
| تَقوَى | Additional | تَقوَى (muqaddar fataḥ) | fataḥ (diptote) |
| فَتَى | 3rd radical | فَتَى (muqaddar kasra) | kasra (not diptote) |
Examples from the Quran
| Āyah | Word | Analysis |
|---|---|---|
| لِلتَّقوَى (Al-Ḥujurāt 49:3) | تَقوَى | diptote, majrūr with muqaddar fataḥ after لِ |
4. Broken Plural Patterns: Mafāʿil and Mafāʿīl
Certain broken plural patterns are inherently mamʿ min al-ṣarf by virtue of their structure. The two most common are:
| Pattern | Example | Meaning |
|---|---|---|
| مَفَاعِل (mafāʿil) | مَسَاجِد | Mosques |
| مَفَاعِيل (mafāʿīl) | مَفَاتِيح | Keys |
These patterns have four syllables with a long vowel near the end, which the Arabs treated as already "heavy" enough to bar the kasra. Rule: after a preposition (majrūr), they take fatḥa, not kasra:
- فِي مَسَاجِدَ ✓ (fatḥa — not kasra)
- ~~فِي مَسَاجِدِ~~ ✗
Common Mistake
Students often write فِي مَسَاجِدِ with kasra because it looks like a regular plural. Remember: if the plural is on mafāʿil/mafāʿīl, it is diptote — use fatḥa in majrūr.
5. Foreign Proper Name — Two Causes Combining
When a word is both a proper name AND non-Arabic (foreign) in origin, both causes apply simultaneously — the word is mamʿ min al-ṣarf by a double reason.
يُوسُفُ
- Cause 1: Proper name (اسم علم)
- Cause 2: Non-Arabic origin (عَجَمِيّ / عَجَمَة) — a Hebrew/Aramaic name
Result: يُوسُفُ never takes tanwīn and takes fataḥ in majrūr: - Marfūʿ (fāʿil): قَالَ يُوسُفُ — Yūsuf said - Majrūr (after preposition): بِيُوسُفَ — (fataḥ, not kasra)
Same rule applies to: مُوسَى، عِيسَى، إِبرَاهِيم، إِسمَاعِيل، إِسحَاق — all foreign names with diptote status.
Session reference: Surah Yusuf Session 5.
6. Alif Maqṣūrah Ending — Why the Diptote "Disappears" From View
A word ending in alif maqṣūrah (ـَى or ـَا) is a diptote whose case markers can never actually be seen — because alif is not a consonant; it is a وَبلَة (a pure vowel-elongation, a "wobble"). Unlike وَاو and يَاء — which double as both consonants and long vowels, and so can carry a ḥarakah (a fataḥ on a wāw is read "wa") — alif carries no sound of its own and cannot bear any ḥarakah on top of it (you cannot place a ḥarakah on a ḥarakah).
زَينَب vs. مُوسَى vs. رُؤْيَا
- زَينَب — diptote, but ends in a regular consonant, so the case markers show: زَينَبُ / زَينَبَ / زَينَبَ
- مُوسَى — diptote AND ends in alif maqṣūrah, so the markers never show: مُوسَى looks identical in marfūʿ, manṣūb, majrūr
- رُؤْيَا (Yūsuf 12:5) — same situation as مُوسَى: it is grammatically a diptote (manṣūb/majrūr would be fataḥ), but the alif hides this completely
"If you peel back that layer and look inside, مُوسَى is not actually marfūʿ-looking — it's just that nothing shows because of this alif."
Session reference: Surah Yusuf Session 6 — applied to رُؤْيَاكَ in لَا تَقْصُصْ رُؤْيَاكَ (Āyah 5); cross-referenced with [[ism-maqsur]].
7. The Two Escapes — When a Diptote Takes a Kasrah Anyway
From Surah Yusuf Session 8. A مَمْنُوع مِن الصَّرْف noun is normally majrūr with a fatḥah — but there are exactly two conditions under which it reverts to a كَسْرَة, becoming in effect triptote again:
| # | Condition |
|---|---|
| 1 | It is a مُضَاف |
| 2 | It carries ال |
Ibn Mālik's Alfiyyah — the Rule and Its Exception in One Couplet
وَجُرَّ بِالفَتْحَةِ مَا لَا يَنْصَرِفْ ⁂ مَا لَمْ يُضَفْ أَوْ يَكُ بَعْدَ أَلْ رَدِفْ
"And put into jarr with the fatḥah that which does not fully decline — so long as it is not made a muḍāf, or does not follow behind ال."
Working through the couplet's own grammar: جُرَّ is مَجهُول, and its نَائِب الفَاعِل is مَا — a مَا مَوْصُولَة, that which. رَدِفْ is a verb whose فَاعِل is the diptote noun itself.
Note the poetic licence: أَلْ is written out with an added alif purely to serve the metre.
رَدِفَ — To Ride Behind
رَدِفَ means to ride behind someone — on the same mount, sharing the saddle, or on the animal immediately following. A رَدِيف is that second rider. The word appears often in ḥadīth: مُعَاذ بن جَبَل رضي الله عنه relates that he was رِدْف النَّبِيِّ ﷺ before receiving the well-known naṣīḥah; it also appears in the narration of الفَضْل بن عَبَّاس during Ḥajj.
Both Escapes in Action
- مَدَارِس — pattern مَفَاعِل, therefore diptote — but as a مُضَاف it takes a kasrah.
- فَلَا أُقْسِمُ بِمَوَاقِعِ النُّجُومِ — مَوَاقِع is on مَفَاعِل and diptote, yet takes a كَسْرَة because it is the muḍāf of النُّجُوم.
This is the same phenomenon already noted for مَسَاجِد (which takes fatḥa in فِي مَسَاجِدَ precisely because it is neither muḍāf nor carrying ال). See [[jam-muntaha-al-jumu]].
8. إِبْرَاهِيم as a بَدَل That Is Also a Diptote
وَعَلَىٰ آلِ يَعْقُوبَ كَمَا أَتَمَّهَا عَلَىٰ أَبَوَيْكَ مِن قَبْلُ إِبْرَاهِيمَ وَإِسْحَاقَ (Yūsuf 12:6)
- إِبْرَاهِيم is a بَدَل from أَبَوَيْكَ — it names the two fathers explicitly (see [[badal]]).
- A بَدَل follows the iʿrāb of its مُبْدَل مِنْه. أَبَوَيْ comes after عَلَىٰ, so it is مَجرُور — and therefore so is إِبْرَاهِيم.
- Yet it shows a فَتْحَة, because it is مَمْنُوع مِن الصَّرْف — and it is diptote because it is a non-Arab (عَجَمِي) proper name, the same double cause already noted for يُوسُفُ.
Session References
- Surah Yusuf Session 8: The two conditions under which a diptote takes a kasrah (muḍāf, ال), with the Alfiyyah couplet وَجُرَّ بِالفَتْحَةِ مَا لَا يَنْصَرِفْ; رَدِيف; مَوَاقِع النُّجُوم and مَدَارِس; إِبْرَاهِيم as a majrūr badal showing fatḥah.
- Surah Al-Hujuraat Session 4: Full treatment of diptotes; contrast between additional vs radical alif; detailed analysis of تَقوَى grammar; examples with female names.
- Surah Al-Hujuraat Session 5: Additional causes — non-Arabic names (مُوسَى) and verb-pattern nouns (أَحمَد); maqṣūr + diptote combination in iʿrāb exercises.
- Surah An-Noor Session 2: Mafāʿil pattern correction — مَسَاجِد takes fatḥa in majrūr (فِي مَسَاجِدَ).
- Surah Yusuf Session 5: يُوسُفُ as example of double cause — proper name + non-Arabic origin.