Mishkat al-Masabih 1029
‘Amr b. al-‘As said:
God’s Messenger taught me fifteen prostrations, while reciting the Qur’an, including three in al-Mufassal , 1 and two in sura al-Hajj 2. 

    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.
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