سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 1329
The Book of Forgetfulness (In Prayer)
Prostration of forgetfulness after saying the salam and speaking
أَخْبَرَنَا مُحَمَّدُ بْنُ آدَمَ، عَنْ حَفْصٍ، عَنِ الأَعْمَشِ، عَنْ إِبْرَاهِيمَ، عَنْ عَلْقَمَةَ، عَنْ عَبْدِ اللَّهِ، أَنَّ النَّبِيَّ صلى الله عليه وسلم سَلَّمَ ثُمَّ تَكَلَّمَ ثُمَّ سَجَدَ سَجْدَتَىِ السَّهْوِ .
It was narrated from 'Abdullah that: The Prophet (ﷺ) said the salam, then he spoke, then he performed two prostrations of forgetfulness.
Sunan an-Nasa'i, 1329Sahih (Darussalam)