فَاء السَّبَبِيَّة — The Causal Fāʾ
فَاء السَّبَبِيَّة (the causal/consequential fāʾ) makes the muḍāriʿ verb after it manṣūb via a hidden and always-omitted أَن. It appears after two contexts: negation and طَلَب (request/expectation).
The Hidden أَن
After فَاء السَّبَبِيَّة, the أَن is always omitted — it is compulsorily hidden (مَحذُوف وُجُوبًا). Writing it explicitly is incorrect.
Context 1 — After Negation
مَا أَسَأتُ إِلَيهِ فَأَعتَذِرَ مِنهُ — I have not wronged him so that I should apologise.
The negation of the first action is the reason (sabab) that would logically produce the second. The فَ signals: the first thing is the cause of what follows.
Context 2 — After طَلَب (Five Types)
The five types of طَلَب that qualify:
| # | Type | Example |
|---|---|---|
| 1 | أَمر (command) | اِجتَهِد فَتَنجَحَ — Work hard so you may succeed |
| 2 | نَهي (prohibition) | لَا تَطغَ فَيَحِلَّ عَلَيكَ غَضَبِي — Don't transgress lest My wrath descend |
| 3 | اِستِفهَام (question) | هَل تُرِيدُ أَن تُعَلِّمَ فَأَجِدَ لَكَ مَكَانًا — Do you wish to teach so I may find you a post? |
| 4 | تَمَنٍّ (impossible wish — لَيتَ) | لَيتَنِي كُنتُ شَابًّا فَأُجَاهِدَ — I wish I were young so I could strive |
| 5 | عَرض (invitation — أَلَا) | أَلَا تَزُورُنَا فَنُكرِمَكَ — Won't you visit us so we may honour you? |
Quranic Examples
After negation — Sūrat Fāṭir (35:36)
لَا يُقضَى عَلَيهِم فَيَمُوتُوا وَلَا يُخَفَّفُ عَنهُم مِّن عَذَابِهَا — "It is not decreed for them that they should die, nor is the punishment ever lightened for them." — يَمُوتُوا is manṣūb (the plural nūn is dropped — the tell-tale sign). Their suffering in نَارُ جَهَنَّمَ does not even grant the relief of death. (جَهَنَّمَ, a feminine proper name/diptote — see [[mamnu-min-alsarf]] — takes fatḥah instead of kasrah as muḍāf ilayh.)
After amar — Sūrat al-Baqara (2:186)
فَليَستَجِيبُوا لِي وَليُؤمِنُوا بِي — command, followed by result.
The Talab Must Be صَرِيح (Explicit)
The طَلَب licensing فَاء السَّبَبِيَّة must be an explicit request/command — not merely something understood to carry that force.
اسم الفِعل Has the Force of a Command — But Isn't One
Words like آمِين, أُفّ, and صَهْ (see [[ism-al-fil]]) carry the meaning of a command but are grammatically اسم, not فِعل. Because the command is only implied rather than spoken as an explicit verb-form, a sentence beginning with such a word cannot license فَاء السَّبَبِيَّة's manṣūb effect on what follows.
An Indicative Sentence That Functions as a Command — al-Ṣaff 61:11
تُؤمِنُونَ بِاللَّهِ وَرَسُولِهِ وَتُجَاهِدُونَ فِي سَبِيلِ اللَّهِ بِأَموَالِكُم وَأَنفُسِكُم "[That] you believe in Allah and His Messenger and strive in the cause of Allah with your wealth and your lives."
Grammatically an informational muḍāriʿ sentence — yet Allah is in fact commanding, not merely informing. Even so, because the command is only understood rather than explicit, this sentence still cannot license فَاء السَّبَبِيَّة the way an actual أَمر / نَهي / اِستِفهَام / تَمَنٍّ / عَرض can.
Further Worked Examples of the Five طَلَب Types
| # | Type | Example | Note |
|---|---|---|---|
| 1 | أَمر | "Fast, so that you become healthy" | becoming healthy is the consequence of fasting |
| 1 | أَمر | "Walk in the sun, then you will get tired" | tiredness is the consequence of walking |
| 3 | اِستِفهَام | "Are you travelling by car, so that I may travel with you?" | — |
| 3 | اِستِفهَام | "Are there any intercessors for us, so that they may intercede?" | — |
| 4 | تَمَنٍّ | يَا لَيتَنِي كُنتُ مَعَهُم فَأَفُوزَ فَوزًا عَظِيمًا (al-Nisāʾ 4:73) | the hypocrites' regret at missing the spoils of war |
| 5 | عَرض | "Won't you come closer to us [so that you may see for yourself]?" | a person who sees with his own eyes is not like one who has merely heard |
تَحضِيض — The Same Particle for Encouragement and Regret
وَلَولَا أَخَّرتَنِي إِلَىٰ أَجَلٍ قَرِيبٍ فَأَصَّدَّقَ (al-Munāfiqūn 63:10) — a dying person's regret: "If only You had reprieved me for a little while, then I would have given charity!"
This use of لَولَا is a طَلَب particle expressing regret over a missed past action — distinct from the counterfactual لَوْلَا (mubtadaʾ + omitted khabar) documented in [[lola]], despite identical spelling. The same particle family can pivot toward encouragement of a still-possible future action ("Work hard, so that you may succeed") depending on context.
Session References
- Both These Lights Session 12: Full treatment — two contexts, five types of طَلَب, Quranic examples; the rule that أَن is always hidden after فَاء السَّبَبِيَّة.
- Surah Yusuf Session 7: Revisited via exercises — the explicit-talab (صَرِيح) requirement contrasted with اسم الفِعل and with al-Ṣaff 61:11's implied command; re-worked Fāṭir 35:36 example with the جَهَنَّمَ diptote note; fresh examples across all five طَلَب types; تَحضِيض/regret use of لَولَا (al-Munāfiqūn 63:10) distinguished from counterfactual لَوْلَا.