(26) باب تَأْوِيلِ قَوْلِ اللَّهِ عَزَّ وَجَلَّ { وَلَقَدْ آتَيْنَاكَ سَبْعًا مِنَ الْمَثَانِي وَالْقُرْآنَ الْعَظِيمَ }
It was narrated that Ibn Abbas said:
"The Prophet (ﷺ) was given seven oft-recited; the seven long ones."
Reference: Sunan an-Nasa'i 915
In-book reference: Book 11, Hadith 40
English translation: Vol. 2, Book 11, Hadith 916