Arabic (Original)
حَدَّثَنَا مُوسَى بْنُ دَاوُدَ حَدَّثَنَا سُلَيْمَانُ بْنُ بِلَالٍ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ عَطَاءِ بْنِ يَسَارٍ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا شَكَّ أَحَدُكُمْ فِي صَلَاتِهِ فَلَمْ يَدْرِ كَمْ صَلَّى ثَلَاثًا أَمْ أَرْبَعًا فَلْيَطْرَحْ الشَّكَّ وَلْيَبْنِ عَلَى مَا اسْتَيْقَنَ ثُمَّ يَسْجُدْ سَجْدَتَيْنِ قَبْلَ أَنْ يُسَلِّمَ فَإِنْ كَانَ صَلَّى خَمْسًا كَانَتْ شَفْعًا لِصَلَاتِهِ قَالَ مُوسَى مَرَّةً فَإِنْ كَانَ صَلَّى خَمْسًا شَفَعْنَ لَهُ صَلَاتَهُ وَإِنْ كَانَ صَلَّى إِتْمَامَ أَرْبَعٍ كَانَتَا تَرْغِيمًا لِلشَّيْطَانِ.
English Translation
Musa ibn Dawud told us, Sulayman ibn Bilal told us, from Zayd ibn Aslam, from Ata' ibn Yasar, from Abu Sa'id al-Khudri, who said: The Messenger of Allah, peace and blessings be upon him, said: "If one of you doubts in his prayer and does not know how much he has prayed, three or four, let him discard the doubt and build upon what is certain, then prostrate twice before giving the salam. If he had prayed five, they will make his prayer even." Musa said once: "If he had prayed five, they will make his prayer even for him, and if he had prayed a complete four, they will be a humiliation for Satan."