Hadithcore
Mishkat al-Masabih, 1029

‘Amr b. al-‘As said:

God’s Messenger taught me fifteen prostrations, while reciting the Qur’an, including three in <i>al-Mufassal</i>, 1 and two in <i>sura al-Hajj</i>2. 1. A title given to the <i>suras</i> from 49 to the end, but several other <i>suras</i> 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.

عَن عَمْرو بن الْعَاصِ قَالَ: أَقْرَأَنِي رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ خَمْسُ عَشْرَةَ سَجْدَةً فِي الْقُرْآنِ مِنْهَا ثَلَاثٌ فِي الْمُفَصَّلِ وَفِي سُورَةِ الْحَجِّ سَجْدَتَيْنِ. رَوَاهُ أَبُو دَاوُد وَابْن مَاجَه

References1 variant
In-Book Reference
Book 4, Hadith 447