حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدٍ حَدَّثَنَا مِسْعَرٌ عَنْ مَنْصُورٍ عَنْ إِبْرَاهِيمَ عَنْ عَلْقَمَةَ عَنْ عَبْدِ اللَّهِ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَأَيُّكُمْ مَا شَكَّ فِي صَلَاتِهِ فَلْيَنْظُرْ أَحْرَى ذَلِكَ الصَّوَابَ فَلْيُتِمَّ عَلَيْهِ وَيَسْجُدْ سَجْدَتَيْنِ
مسند امام احمد بن حنبل · Hadith 4348
It was narrated that 'Abdullah said: The Messenger of Allah (PBUH) said: "I am only human; I forget as you forget. So if any of you is not sure about his prayer, let him see what is most likely to be the case and then complete it on that basis and prostrate twice."
Translated by Dr. Muhammad Muhsin Khan · Reviewed by Islamic University of Madinah · Published March 2020