(25) باب التَّحَرِّي
It was narrated from Abu Hurairah that:
The Messenger of Allah (ﷺ) said: "When any one of you gets up and prays, the Shaitan comes to him an confuses him until he does not know how many (Rak'ahs) he prayed. If any one of you notices that, let him prostrate twice when he is sitting."
Reference: Sunan an-Nasa'i 1252
In-book reference: Book 13, Hadith 74
English translation: Vol. 2, Book 13, Hadith 1253