وَلَقَدْ ءَاتَيْنَٰكَ سَبْعًا مِّنَ ٱلْمَثَانِى وَٱلْقُرْءَانَ ٱلْعَظِيمَ
The root was analysed at al-Zumar 39/23, and what was recorded there holds here too; I rely on that treatment:
ث-ن-ي: to fold, to double, to repeat. And in al-Zumar three readings were set out in a table for what the word mathānī corresponds to:
| Reading | What mathānī is |
|---|---|
| 1 | Repeated — the recurrence of the stories, the rulings, the warnings |
| 2 | In pairs — its coming in couples such as garden and fire, glad tidings and warning |
| 3 | Folded — coming section by section, one upon another |
| Place | Construction | What mathānī qualifies |
|---|---|---|
| al-Zumar 39/23 | Kitāban mutashābihan mathāniya | The whole of the Book |
| al-Ḥijr 15/87 | Sabʿan mina'l-mathānī | A part of the mathānī — seven |
That is, in al-Zumar the word is an attribute of the whole, in al-Ḥijr the source of a part. The particle must be recorded: min here conveys partitiveness (tabʿīḍ).
| View | What sabʿan mina'l-mathānī is | Its ground |
|---|---|---|
| 1 | Sūrat al-Fātiḥa — seven verses | Al-Fātiḥa is seven verses and is repeated in the prayer; mathānī means "repeated" |
| 2 | The seven long sūras (al-sabʿu'l-ṭiwāl) | The longest sūras of the Qurʾān are counted as a group |
| 3 | The whole of the Qurʾān — mathānī is its name, and "seven" states its divisions | At al-Zumar 39/23 the whole Book is called mathānī |
| 4 | Seven subjects or seven pairs repeated in the Qurʾān | The "in pairs" reading of mathānī |
One. Sabʿan is indefinite and without a specifier — the question "seven what?" is not answered in the sentence. The verse gives the number and not the thing numbered. This is the source of the disagreement.
Two. There is a conjunction in the sentence: wa'l-Qurʾāna'l-ʿaẓīm. Disagreement arises over the function of the conjunction as well:
| Reading | The work of the conjunction |
|---|---|
| a | Separating — the seven are one thing, the Qurʾān another |
| b | Explanatory (ʿaṭf al-bayān) — the seven are the Qurʾān itself |
| c | A reference from part to whole — after the part is named, the whole is named |
Sūrat al-Fātiḥa was treated in the index at al-Fātiḥa; the number of its verses and the question of counting the basmala were taken up there. I rely on that treatment.
I record an observation about the word order: the verse prepares the command of the eighty-eighth verse. First what has been given is named, then it is said "do not look at what is in another's hand". Had the sequence been reversed, the command would have stood bare.