It was narrated from Abu Hurairah that:

"The Messenger of Allah ﷺ said the salam then he performed two prostrations of forgetfulness while he was still sitting, then he said the salam." He said: He mentioned it in the hadith of Dhul-Yadain.

أَخْبَرَنَا سُوَيْدُ بْنُ نَصْرٍ، عَنْ عَبْدِ اللَّهِ بْنِ الْمُبَارَكِ، عَنْ عِكْرِمَةَ بْنِ عَمَّارٍ، قَالَ حَدَّثَنَا ضَمْضَمُ بْنُ جَوْسٍ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ ﷺ سَلَّمَ ثُمَّ سَجَدَ سَجْدَتَىِ السَّهْوِ وَهُوَ جَالِسٌ ثُمَّ سَلَّمَ . قَالَ ذَكَرَهُ فِي حَدِيثِ ذِي الْيَدَيْنِ .