"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.
Sunan an-Nasa'i Book 13, Hadith 152
← Previous Hadith The Prophet (ﷺ) said the salam, then he spoke, then he performed two prostrations of forgetfulness.

Sunan an-Nasa'i Book 13, Hadith 151 Next Hadith → The Prophet (ﷺ) prayed three (rak'ahs) then said the taslim. Al-Khirbaq said: "You prayed three." So he led them in praying the remaining rak'ah, then he said the taslim, then he did the two prostrations of forgetfulness, then he said the taslim (again).

Sunan an-Nasa'i Book 13, Hadith 153