Sahih Muslim 570
Sahih Muslim · Book 5: The Book of Mosques and Places of Prayer · As-Sahw (forgetfulness) in prayer and prostrating to compensate for it
'Abdullah b. Malik ibn Buhaina al-Asadi reported:
وَحَدَّثَنَا أَبُو الرَّبِيعِ الزَّهْرَانِيُّ ، حَدَّثَنَا حَمَّادٌ ، حَدَّثَنَا يَحْيَى بْنُ سَعِيدٍ ، عَنْ عَبْدِ الرَّحْمَنِ الأَعْرَجِ ، عَنْ عَبْدِ اللَّهِ بْنِ مَالِكٍ ابْنِ بُحَيْنَةَ الأَزْدِيِّ ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَامَ فِي الشَّفْعِ الَّذِي يُرِيدُ أَنْ يَجْلِسَ فِي صَلاَتِهِ فَمَضَى فِي صَلاَتِهِ فَلَمَّا كَانَ فِي آخِرِ الصَّلاَةِ سَجَدَ قَبْلَ أَنْ يُسَلِّمَ ثُمَّ سَلَّمَ .
The Messenger of Allah (ﷺ) stood up (at the end of two rak'ahs) when he had to sit and proceeded on with the prayer. But when he was at the end of the prayer, he performed a prostration before the salutation and then pronounced the salutation.