Surah Al-Hijr 15:87

وَلَقَدْ ءَاتَيْنَـٰكَ سَبْعًا مِّنَ ٱلْمَثَانِى وَٱلْقُرْءَانَ ٱلْعَظِيمَ

And We have certainly given you, [O Muḥammad], seven of the often repeated [verses] and the great Qur’ān.

Translation: Saheeh International

Tafsir

And verily We have given you seven of the oft-repeated verses — the Prophet s said that this meant sūrat al-Fātiha as reported by the two Shaykhs Bukhārī and Muslim since it is repeated in every unit of prayer rak‘a — and the great Qur’ān.

Excerpt from Tafsir al-Jalalayn, commentary on 15:87, via Quran.com. The reader has the full commentary and 9 more tafsirs.