‘Amr b. al-‘As said

Allah's Messenger ﷺ taught me fifteen prostrations, while reciting the Qur’an, including three in al-Mufassal, 1 and two in sura al-Hajj2. 1. A title given to the suras from 49 to the end, but several other suras are also mentioned: 37, 45, 47, 48, 50, 61, 67, 87, and 93. The name is most appropriately explained ay meaning that this is the section of the Qur’an which contains many shorter suras. 2. Al-Qur’an; 22 Abu Dawud and Ibn Majah transmitted it.