وَعَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ
أَنَّهُ قَالَ: إِنَّ لِكُلِّ شَيْءٍ سَنَامًا وَإِنَّ سَنَامَ الْقُرْآنِ سُورَةُ الْبَقَرَةِ وَإِنَّ لِكُلِّ شَيْءٍ لُبَابًا وَإِنَّ لباب الْقُرْآن الْمفصل
37, 45, 47, 48, 50, 61, 67, and 93. The name is most appropriately explained as meaning that this is the section of the Qur’an which contains many shorter suras. Darimi transmitted it.
Mishkat al-Masabih 2083, Book 9, The Excellent Qualities of the Qur'an, Hadith 69. 1 min read