(75) باب سَجْدَتَىِ السَّهْوِ بَعْدَ السَّلاَمِ وَالْكَلاَمِ
It was narrated from 'Abdullah that:
The Prophet (ﷺ) said the salam, then he spoke, then he performed two prostrations of forgetfulness.
Reference: Sunan an-Nasa'i 1329
In-book reference: Book 13, Hadith 151
English translation: Vol. 2, Book 13, Hadith 1330