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Jawāb al-Qasam (جواب القسم)

Summary: The "response to the oath" — the main clause that follows a Quranic oath; sometimes stated, sometimes omitted; and how related sūrahs supply the missing answer.

Definition

In Arabic, an oath (qasam) is followed by a response clause called the jawāb al-qasam (جواب القسم) — the statement the oath is meant to affirm. For example:

"By the Quran, [you are among the messengers]." — The bracketed part is the jawāb al-qasam.

The jawāb al-qasam may be stated explicitly or omitted for rhetorical effect. (source: surah_yusuf_session3.md)

The Three Sūrahs with an Oath by "Qur'ān"

Across the entire Quran, there are only three sūrahs where Allah takes an oath using the word القرآن by name:

Sūrah Muqattaʿāt Jawāb al-Qasam
Sūrah Yā-Sīn (يس) يس — 2 letters ✅ Stated: "Innaka la-mina al-mursalīn" — "Indeed you are among the messengers"
Sūrah Sād (ص) ص — 1 letter ❌ Omitted
Sūrah Qāf (ق) ق — 1 letter ❌ Omitted

The pattern: The sūrah with two Muqattaʿāt letters (Yā-Sīn) states its jawāb al-qasam. The sūrahs with one Muqattaʿ letter (Sād, Qāf) omit theirs. (source: surah_yusuf_session3.md)

Recovering the Missing Jawāb al-Qasam

When we want to recover the omitted jawāb al-qasam in Sūrah Sād or Sūrah Qāf, Sūrah Yā-Sīn provides the answer — since all three share the same oath by the Quran, and Yā-Sīn makes it explicit. The implied meaning across all three is: "Indeed you (the Prophet ﷺ) are among the messengers."

The Principle: Al-Qur'ān Yufassiru Baʿduhu Baʿḍan

This recovery illustrates the great principle of Quranic tafsīr:

"Al-Qur'ān yufassiru baʿduhu baʿḍan" القرآن يفسر بعضه بعضاً One part of the Quran explains another part of the Quran.

This is considered the most authoritative method of tafsīr — before consulting hadith, before consulting the statements of the Companions, and before linguistic analysis.

Teacher's reflection: "This is something we need to train our minds towards — making connections between one part of the Quran and another. The Hurūf Muqattaʿāt are an interesting kind of mystery. Scholars have spent their lives on such connections and found deeply beneficial insights. Who knows — perhaps we will too." (source: surah_yusuf_session3.md)

Grammatical Rules for Jawab al-Qasam

The jawab al-qasam is always a sentence (joomla). Its emphasis markers depend on the sentence type:

Summary Chart

Jawab al-Qasam
│
├── Joomla ISMIA (Nominal)
│   ├── Affirmative → inna + lam (or one alone)
│   └── Negative    → no emphasis
│
└── Joomla FA'LIYA (Verbal)
    ├── Fail MADI, Affirmative    → lam + qad
    ├── Fail MADI, Negative       → no emphasis
    ├── Fail MUDARI, Future, Aff. → lam + nunu sakhila
    ├── Fail MUDARI, Present, Aff.→ lam only (no nunu)
    └── Fail MUDARI, Negative     → no emphasis

Case 1 — Joomla Ismia, Affirmative

Must use inna + lam al-muzahlaka (or one of the two).

The "skidding lam" (لَامُ المُزَاحَلَقَة) slips from the beginning of the sentence and attaches to the khabar of inna. It represents the highest level of emphasis for a nominal sentence.

Levels of emphasis progression: - al-baytu jamilun → no emphasis - lal-baytu jamilun → lam al-ibtida - inna al-bayta jamilun → inna - inna al-bayta la-jamilun → inna + lam (maximum for ismia) - wallahi inna al-bayta la-jamilun → qasam + inna + lam (oath level)

Case 2 — Joomla Fa'liya, Fail Madi, Affirmative

Must use lam + qad.

Exception: with jammed verbs (ni'ma, bi'sa) that have no mudari form — use lam only (qad cannot accompany them).

تَاللهِ لَقَد آثَرَكَ اللهُ عَلَينَا (Surah Yusuf 12:91) — lam + qad on fail madi.

Case 3 — Joomla Fa'liya, Fail Mudari, Future, Affirmative

Must use lam + nunu sakhila, with three conditions: 1. Meaning is future (mustaqbal), not present (hal) 2. Verb directly attached to lam — not separated by saufa/sa or a shibujumla 3. No element stands between lam and the verb

If saufa/sa separates lam and verb → lam only, no nunu.

وَلَسَوفَ يُعطِيكَ رَبُّكَ (Surah al-Duha 93:5) — saufa present → lam only.

Case 4 — All Negative Sentences

Never emphasised. No inna, no lam, no nunu. Negation only with مَا (ma) or لَا (la); not lam or lan.

مَا وَدَّعَكَ رَبُّكَ وَمَا قَلَى (Surah al-Duha 93:3) — both negative madiverbs, no emphasis.

When the Qasam Itself Is Omitted

Sometimes the full qasam construct (waw/ba/ta/verb) is omitted and only the jawab remains. A lam al-tauki at the beginning of the jawab is the clue that a qasam was present but is implied.

لَتُسأَلُنَّ عَمَّا كُنتُم تَعمَلُونَ (Surah al-Nahl 16:93) The lam before تُسأَلُنَّ signals an implicit oath even with no explicit qasam particle.

Jawab al-Qasam in the La-In Construction

In the combination لَئِن (la-in) — which appears 60+ times in the Quran — the lam marks an implicit kasam before the shart. The jawab follows qasam rules (not shart rules), so no fa appears where shart would normally demand one, and the appropriate emphasis markers (inna/lam/nunu) appear instead.

See: lain-combination