Sahih Muslim
The Book of Mosques and Places of Prayer — Hadith #1166
Scholarly Consensus: Sahih How we grade
حَدَّثَنِي عَمْرٌو النَّاقِدُ، وَزُهَيْرُ بْنُ حَرْبٍ، قَالاَ حَدَّثَنَا سُفْيَانُ، - وَهُوَ ابْنُ عُيَيْنَةَ - ح قَالَ وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، وَمُحَمَّدُ بْنُ رُمْحٍ، عَنِ اللَّيْثِ بْنِ سَعْدٍ، كِلاَهُمَا عَنِ الزُّهْرِيِّ، بِهَذَا الإِسْنَادِ نَحْوَهُ .
The Messenger of Allah (ﷺ) said: When any one of you stands up to pray, the devil comes to him and confuses him to that he does not know how much he has prayed. If any one of you has such an experience he should perform two prostrations while sitting down (in qa'da).
Inlined from hadith #8442 — translator’s back-reference.
Hadith Grading
Each grade below reflects one scholar's assessment of the chain of transmission. The grade describes the chain, not the Prophet's words. How we grade
Scholarly Consensus: Sahih