"They used to say: 'If one is not sure of what he estimates is correct, then prostrate twice.'"
Sunan an-Nasa'i Book 13, Hadith 69
← Previous Hadith "Whoever has doubt, or is not sure, let him estimate what is correct, then let him prostrate twice."

Sunan an-Nasa'i Book 13, Hadith 68 Next Hadith → "The Messenger of Allah (ﷺ) said: 'Whoever has doubt during his prayer, let him prostrate twice after he has said the taslim'".

Sunan an-Nasa'i Book 13, Hadith 70