The Apostle of Allah ﷺ performed two prostrations for forgetfulness after salutation and talking.  

أَنَّ النَّبِيَّ ﷺ سَجَدَ سَجْدَتَىِ السَّهْوِ بَعْدَ السَّلاَمِ وَالْكَلاَمِ  

Abu Hurairah reported; He then made two prostration on account of forgetfulness after he had given the salutation.  

ثُمَّ سَجَدَ سَجْدَتَىِ السَّهْوِ بَعْدَ مَا سَلَّمَ  

"The Prophet (S) performed two prostrations after the Salam."  

أَنَّ النَّبِيَّ ﷺ سَجَدَهُمَا بَعْدَ السَّلاَمِ  

The Prophet ﷺ prostrated after the salam when he was not sure. (Using translation from Nasāʾī 1235)   

عَنِ النَّبِيِّ ﷺ سَجَدَهُمَا بَعْدَ التَّسْلِيمِ  

[Machine] The Prophet Muhammad ﷺ performed the two prostrations of forgetfulness after the greeting of peace.  

سَجَدَ رَسُولُ اللهِ ﷺ سَجْدَتَيِ السَّهْوِ بَعْدَ السَّلَامِ  

[Machine] "That the Messenger of Allah ﷺ mistakenly greeted [in prayer] during his prostration."  

«أَنَّ رَسُولَ اللهِ ﷺ سَلَّمَ فِي سَجْدَتَيِ السَّهْوِ»  

[Machine] The Messenger of Allah ﷺ said, "For every unintentional mistake, there are two prostrations after the completion of the prayer."  

قَالَ رَسُولُ اللهِ ﷺ «لِكُلِّ سَهْوٍ سَجْدَتَانِ بَعْدَ التَّسْلِيمِ»  

"سجْدتَا السَّهوِ بعْد التَّسْليم، وفيهَا تَشَهُّدٌ وسلَامٌ".  

"إِنَّ النَّبِىَّ ﷺ سَجَدَ سَجْدَتَى السَّهْوِ بَعْدَ الْكَلَام".