‘Abdallāh b. Mas'ūd said, “Everything has a hump, and the hump of the Qur’ān is <i>sūra al-Baqara</i>. Everything has a kernel, and the kernel of the Qur’ān is <i>al-Mufassal</i>.* *A title given to the <i>sūras</i> from 49 to the end, but several other <i>sūras</i> are also mentioned:

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’ān which contains many shorter <i>sūras</i>. Dārimī transmitted it.

وَعَنْ عَبْدِ اللَّهِ بْنِ مَسْعُودٍ أَنَّهُ قَالَ: إِنَّ لِكُلِّ شَيْءٍ سَنَامًا وَإِنَّ سَنَامَ الْقُرْآنِ سُورَةُ الْبَقَرَةِ وَإِنَّ لِكُلِّ شَيْءٍ لُبَابًا وَإِنَّ لباب الْقُرْآن الْمفصل. رَوَاهُ الدَّارمِيّ