Arabic (Original)
أَخْبَرَنَا أَبُو عَلِيٍّ الرُّوذْبَارِيُّ أنبأ أَبُو بَكْرِ بْنُ دَاسَةَ ثنا أَبُو دَاوُدَ ثنا الْقَعْنَبِيُّ عَنْ مَالِكٍ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ عَطَاءِ بْنِ يَسَارٍ أَنَّ رَسُولَ اللهِ ﷺ قَالَ إِذَا شَكَّ أَحَدُكُمْ فِي صَلَاتِهِ فَلَمْ يَدْرِ كَمْ صَلَّى ثَلَاثًا أَوْ أَرْبَعًا فَلْيُصَلِّ رَكْعَةً وَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ قَبْلَ التَّسْلِيمِ فَإِنْ كَانَتِ الرَّكْعَةُ الَّتِي صَلَّى خَامِسَةً شَفَعَهَا بِهَاتَيْنِ وَإِنْ كَانَتْ رَابِعَةً فَالسَّجْدَتَانِ تَرْغِيمٌ لِلشَّيْطَانِ وَقَدْ رُوِّينَاهُ مِنْ حَدِيثِ سُلَيْمَانَ بْنِ بِلَالٍ وَهِشَامِ بْنِ سَعْدٍ عَنْ زَيْدِ بْنِ أَسْلَمَ عَنْ عَطَاءِ بْنِ يَسَارٍ عَنْ أَبِي سَعِيدٍ مَوْصُولًا وَقَدْ رُوِيَ مِنْ حَدِيثِ مَالِكٍ أَيْضًا مَوْصُولًا
English Translation
The Messenger of Allah (peace be upon him) said: If one of you has doubt in his prayer and does not know whether he prayed three or four, let him pray a rak'ah and prostrate two prostrations while sitting before the salam. If the rak'ah he prayed was the fifth, they make it even. If it was the fourth, the two prostrations are a humiliation for Shaytan. We have also narrated it from the hadith of Sulayman ibn Bilal and Hisham ibn Sa'd from Zayd ibn Aslam from Ata' ibn Yasar from Abu Sa'id in a connected chain. It was also narrated from the hadith of Malik in a connected chain.