حَدَّثَنَا أَبُو کُرَيْبٍ حَدَّثَنَا أَبُو خَالِدٍ الْأَحْمَرُ عَنْ ابْنِ عَجْلَانَ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ عَطَائِ بْنِ يَسَارٍ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّی اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا شَکَّ أَحَدُکُمْ فِي صَلَاتِهِ فَلْيُلْغِ الشَّکَّ وَلْيَبْنِ عَلَی الْيَقِينِ فَإِذَا اسْتَيْقَنَ التَّمَامَ سَجَدَ سَجْدَتَيْنِ فَإِنْ کَانَتْ صَلَاتُهُ تَامَّةً کَانَتْ الرَّکْعَةُ نَافِلَةً وَإِنْ کَانَتْ نَاقِصَةً کَانَتْ الرَّکْعَةُ لِتَمَامِ صَلَاتِهِ وَکَانَتْ السَّجْدَتَانِ رَغْمَ أَنْفِ الشَّيْطَانِ
ابن ماجہ · Hadith 1210
It was narrated that Abu Saeed AI-Khudri said: "The Messenger of Allah SAW said: 'If anyone of you is uncertain about his prayer, let him put aside uncertainty and act upon that which is certain. When he has made sure that his prayer is complete, then let him prostrate twice. Then if his prayer was complete, that (extra) Rak'ah will be counted as voluntary, and if his prayer was lacking, that Rak'ah will complete his prayer, and the two prostrations will rub the Satan's nose in the dust. ’ "(Sahih).
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020