[Machine] The Messenger of Allahﷺ prayed with us, and sometimes he added and sometimes he omitted. Ibrahim said, "The forgetfulness was a result of my doing." So we asked him, "O Messenger of Allah, did you introduce something new in the prayer?" He said, "What is that?" We said, "You prayed before in such and such a way." He said, "Indeed, I am only a human, I forget just as you forget. So if any one of you forgets something, let him prostrate twice, then turn and prostrate twice."  

صَلَّى بِنَا رَسُولُ اللهِ ﷺ فَإِمَّا زَادَ وَإِمَّا نَقَصَ قَالَ إِبْرَاهِيمُ وَإِنِمَّا جَاءَ نِسْيَانُ ذَلِكَ مِنْ قِبَلِي فَقُلْنَا يَا رَسُولَ اللهِ أَحَدَثَ فِي الصَّلَاةِ شَيْءٌ؟ قَالَ وَمَا ذَاكَ؟ قُلْنَا صَلَّيْتَ قَبْلُ كَذَا وَكَذَا قَالَ إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَإِذَا نَسِيَ أَحَدُكُمْ فَلْيَسْجُدْ سَجْدَتَيْنِ ثُمَّ تَحَوَّلَ فَسَجَدَ سَجْدَتَيْنِ  

[Machine] The messenger of Allah ﷺ prayed with us a prayer in which he either added or omitted something. When he finished, we asked, "O messenger of Allah, did you introduce something new in the prayer?" He replied, "I did not introduce anything new in the prayer. However, I am a human being and I forget just as you forget. So if I forget, remind me, and if any one of you is unsure about his prayer, he should strive to do it correctly and then perform two prostrations."  

صَلَّى بِنَا رَسُولُ اللَّهِ ﷺ صَلَاةً زَادَ فِيهَا أَوْ نَقَصَ مِنْهَا فَلَمَّا أَتَمَّ قُلْنَا يَا رَسُولَ اللَّهِ أَحَدَثَ فِي الصَّلَاةِ شَيْءٌ؟ قَالَ فَثَنَى رِجْلَهُ فَسَجَدَ سَجْدَتَيْنِ ثُمَّ قَالَ « لَوْ حَدَثَ فِي الصَّلَاةِ شَيْءٌ لَأَخْبَرْتُكُمْ بِهِ وَلَكِنْ إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَإِذَا نَسِيتُ فَذَكِّرُونِي وَإِذَا أَحَدُكُمْ شَكَّ فِي صَلَاتِهِ فَلْيَتَحَرَّى الصَّوَابَ وَلْيَبْنِ عَلَيْهِ ثُمَّ لْيَسْجُدْ سَجْدَتَيْنِ»  

The Prophet ﷺ prayed (and the sub-narrator Ibrahim said, "I do not know whether he prayed more or less than usual"), and when he had finished the prayers he was asked, "O Messenger of Allah ﷺ! Has there been any change in the prayers?" He said, "What is it?' The people said, "You have prayed so much and so much." So the Prophet ﷺ bent his legs, faced the Qibla and performed two prostration's (of Sahu) and finished his prayers with Taslim (by turning his face to right and left saying: 'As-Salamu ʿAlaikum- Warahmat-ullah'). When he turned his face to us he said, "If there had been anything changed in the prayer, surely I would have informed you but I am a human being like you and liable to forget like you. So if I forget remind me and if anyone of you is doubtful about his prayer, he should follow what he thinks to be correct and complete his prayer accordingly and finish it and do two prostrations (of Sahu). (Using translation from Bukhārī 401)  

عَبْدُ اللَّهِ صَلَّى رَسُولُ اللَّهِ ﷺ صَلَاةً قَالَ إِبْرَاهِيمُ لَا أَدْرِي أَزَادَ نَقَصَ فَلَمَّا سَلَّمَ قِيلَ لَهُ يَا رَسُولَ اللَّهِ أَحَدَثَ فِي الصَّلَاةِ شَيْءٌ؟ قَالَ «لَا وَمَا ذَاكَ؟ » قَالُوا صَلَّيْتَ كَذَا وَكَذَا قَالَ فَثَنَى رِجْلَهُ وَاسْتَقْبَلَ الْقِبْلَةَ وَسَجَدَ سَجْدَتَيْنِ ثُمَّ سَلَّمَ فَلَمَّا أَقْبَلَ عَلَيْنَا بِوَجْهِهِ قَالَ «إِنَّهُ لَوْ حَدَثَ فِي الصَّلَاةِ شَيْءٌ أَنْبَأْتُكُمْ بِهِ وَلَكِنِّي إِنَّمَا أَنَا بَشَرٌ مِثْلُكُمْ أَنْسَى كَمَا تَنْسَوْنَ فَإِذَا نَسِيتُ فَذَكِّرُونِي وَإِذَا شَكَّ أَحَدُكُمْ فِي صَلَاتِهِ فَلْيَتَحَرَّ الصَّوَابَ وَلْيُتِمَّ عَلَيْهِ ثُمَّ لْيُسَلِّمْ ثُمَّ لْيَسْجُدْ سَجْدَتَيْنِ»