(25) باب التَّحَرِّي
It was narrated 'Abdullah bin Ja'far that :
The Messenger of Allah (ﷺ) said: "Whoever has doubt during his prayer, let him prostrate twice after he said the taslim." (ID)
Reference (ID): Sunan an-Nasa'i 1249 (ID)
In-book reference (ID): Book 13, Hadith 71 (ID)
English translation (ID): Vol. 2, Book 13, Hadith 1250 (ID)