(25) باب التَّحَرِّي
It was narrated that 'Abdullah said:
"The Messenger of Allah (ﷺ) said: 'If one of you is not sure about his prayer, let him estimate and prostrate twice after he has finished." (DE)
Reference (DE): Sunan an-Nasa'i 1241 (DE)
In-book reference (DE): Book 13, Hadith 63 (DE)
English translation (DE): Vol. 2, Book 13, Hadith 1242 (DE)