(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." (PT)
Reference (PT): Sunan an-Nasa'i 1246 (PT)
In-book reference (PT): Book 13, Hadith 68 (PT)
English translation (PT): Vol. 2, Book 13, Hadith 1247 (PT)