قَبْلُ and بَعْدُ — The Three-Case Rule
قَبْل (before) and بَعْد (after) are ظَرْف زَمَان — adverbs of time. Their ending tells you something precise about what has happened to their مُضَاف إِلَيْه, and the rule has three distinct cases.
The Rule at a Glance
| مُضَاف إِلَيْه | Status of the word | Ending | Example |
|---|---|---|---|
| Mentioned | مُعْرَب — declines normally | كَسْرَة after مِن | مِن قَبْلِهِ |
| Omitted but intended | مَبْنِي عَلَى الضَّمّ | ضَمَّة | مِن قَبْلُ |
| Neither mentioned nor intended | مُعْرَب, and given tanwīn | ـًا | قَبْلًا / بَعْدًا |
Case 1 — Omitted but Intended → مَبْنِي عَلَى الضَّمّ
Two Conditions Together
قَبْلُ and بَعْدُ are built on the ضَمَّة when:
- the مُضَاف إِلَيْه is omitted (حُذِفَ المُضَافُ إِلَيْه); and
- it is nevertheless intended (نُوِيَ مَعْنَاهُ) — you do mean "before that particular thing," you simply do not say it.
A Simple Illustration
أَنَا الآنَ مُدَرِّسٌ، وَكُنْتُ مِنْ قَبْلُ إِدَارِيًّا
"I am now a teacher; before that I was an administrator."
"Before that" — before being a teacher — is fully intended, just not spelled out.
Quranic Evidence
Sūrat Yūsuf 12:6 — the case that prompted the discussion
كَمَا أَتَمَّهَا عَلَىٰ أَبَوَيْكَ مِن قَبْلُ
"…before this, He completed the same favour upon your fathers." The "before this" is clearly meant, and simply not stated.
سُورَة الرُّوم — two instances in one āyah
لِلَّهِ الْأَمْرُ مِن قَبْلُ وَمِن بَعْدُ ۚ وَيَوْمَئِذٍ يَفْرَحُ الْمُؤْمِنُونَ
The context is the Romans: defeated, but within a few years they will overpower the Persians. Both the defeat and the eventual victory belong to Allah's command — before it and after it.
سُورَة يُونُس — آلْآنَ وَقَدْ عَصَيْتَ قَبْلُ
آلْآنَ وَقَدْ عَصَيْتَ قَبْلُ وَكُنتَ مِنَ الْمُفْسِدِينَ
Spoken to Firʿawn as he drowns and declares belief in the Lord of Mūsā. قَبْلُ unmistakably means before this moment — before the moment in which you now proclaim īmān.
سُورَة القَصَص — أَوَلَمْ يَكْفُرُوا بِمَا أُوتِيَ مُوسَىٰ مِن قَبْلُ
أَوَلَمْ يَكْفُرُوا بِمَا أُوتِيَ مُوسَىٰ مِن قَبْلُ ۖ قَالُوا سِحْرَانِ تَظَاهَرَا وَقَالُوا إِنَّا بِكُلٍّ كَافِرُونَ
They had said "if only he were given the like of what Mūsā was given" — meaning the Tawrāh, or the miracles of Mūsā عليه السلام. Allah answers: did you not already reject what Mūsā was given, before this? Here مِن قَبْلُ can mean before the coming of the Quran or before the coming of the Messenger ﷺ — both meanings are available.
Their own words condemn them: سِحْرَانِ تَظَاهَرَا, "two pieces of magic supporting each other" — the Tawrāh attesting the Quran and the Quran attesting the Tawrāh — followed by إِنَّا بِكُلٍّ كَافِرُونَ.
Case 2 — Mentioned → مُعْرَب
When the مُضَاف إِلَيْه is actually present, the word declines completely normally:
مِن قَبْلِهِ — the هُ is the muḍāf ilayhi, so قَبْلِ is simply مَجرُور with a kasrah. Not مَبْنِي at all.
Case 3 — Neither Mentioned nor Intended → مُعْرَب with تَنوِين
Here the muḍāf ilayhi is omitted and you do not even intend one — you are not thinking "before what" at all. Then the word is مُعْرَب and takes تَنوِين:
قَبْلًا — previously · بَعْدًا — later
لَمْ يُنْوَ
The Arabic phrasing of the condition is لَمْ يُنْوَ — "it was not intended." The morphology: نِيَّة → نَوَى / يَنْوِي → passive يُنْوَى → jussive لَمْ يُنْوَ, the final weak letter dropping because of the جَزْم caused by لَمْ.
Everyday Illustrations
كُنْتُ مُدَرِّسًا قَبْلًا — "I was a teacher previously" — with no particular "before what" in mind.
سَأَزُورُكَ بَعْدًا إِنْ شَاءَ اللَّه — "I will visit you later" — not after ṣalāh, not after dinner; just later.
Iʿrāb: بَعْدًا is مَنصُوب because it is a ظَرْف زَمَان. Even though "later" names no precise moment, it is still a unit of time.
English Equivalents
The best English renderings of this third case are exactly "previously" and "later" — words that carry no implied complement.
Poetic Evidence (شَوَاهِد)
فَسَاغَ لِيَ الشَّرَابُ وَكُنْتُ قَبْلًا
فَسَاغَ لِيَ الشَّرَابُ وَكُنْتُ قَبْلًا ⁂ أَكَادُ أَغَصُّ بِالْمَاءِ الفُرَاتِ
"So the drink went down easily for me — and previously I would almost choke on sweet water."
سَاغَ = to become easy to swallow; its فَاعِل is الشَّرَاب. The poet was in such distress before that even sweet water made him splutter — whereas hot water goes down easily on the throat. Now that his state has changed, even the wine goes down easily. قَبْلًا here is simply "previously": before what is neither specified nor intended.
وَنَحْنُ قَتَلْنَا الأُسْدَ أُسْدَ خَفِيَّةٍ
وَنَحْنُ قَتَلْنَا الأُسْدَ أُسْدَ خَفِيَّةٍ ⁂ فَمَا شَرِبُوا بَعْدًا عَلَى لَذَّةٍ خَمْرَا
"And we — we killed the lions, the lions of Khafiyyah; so never after did they drink wine for pleasure."
الأُسْد is a plural of أَسَد; خَفِيَّة was a place of dense, thorny thicket where lions dwelt. The poet boasts of killing enemy warriors — "the lions of Khafiyyah."
Note the emphasis in وَنَحْنُ قَتَلْنَا: قَتَلْنَا alone would suffice, since نَا already indicates the subject; opening with the detached نَحْنُ is emphatic — it is we who killed them.
And بَعْدًا does not mean "after killing them." It means simply thereafter, ever again — they were never able to enjoy wine again. The muḍāf ilayhi is not intended, and the تَنوِين is exactly what tells us so.
(The phrase الأُسْدَ أُسْدَ خَفِيَّةٍ raised the question of عَطْف البَيَان — a concept the class had not yet covered, deferred to a future session with this couplet as the worked example.)
Session References
- Surah Yusuf Session 8: The complete three-case rule with مِن قَبْلُ in Āyah 6; Quranic evidence from al-Rūm, Yūnus and al-Qaṣaṣ; the poetic shawāhid for قَبْلًا and بَعْدًا.