Allah's Messenger (S) said: "Indeed the Shaitan comes to one of you in his Salat confusing him until he does now know how much he has prayed. When one of you experiences that then let him perform two prostrations while sitting."
Reference: Jami` at-Tirmidhi 397 In-book : Book 2, Hadith 250 English translation : Vol. 1, Book 2, Hadith 397
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