(25) باب التَّحَرِّي
It was narrated that 'Abdullah said:
"Whoever has doubt, or is not sure, let him estimate what is correct, then let him prostrate twice." (DE)
Reference (DE): Sunan an-Nasa'i 1246 (DE)
In-book reference (DE): Book 13, Hadith 68 (DE)
English translation (DE): Vol. 2, Book 13, Hadith 1247 (DE)