It was narrated from ‘Amr bin ‘As that the Messenger of Allah ﷺ taught him fifteen prostrations in the Qur’an, including three in the Mufassal and two in Al-Hajj. (Using translation from Ibn Mājah 1057)
أَنَّ رَسُولَ اللَّهِ ﷺ أَقْرَأَهُ خَمْسَ عَشْرَةَ سَجْدَةً فِي الْقُرْآنِ ثَلَاثَةً فِي الْمُفَصَّلِ وَسُورَةِ الْحَجِّ سَجْدَتَيْنِ «»