The Messenger of Allah ﷺ said the prayer; (the narrator added): He made some act of omission or commission when he pronounced salutation; it was said to him: Messenger of Allah, is there something new about the prayer? He (the Holy Prophet) said: What is it? They said: You said prayer in such and such away. He (the narrator) said: He (the Holy Prophet) turned his feet and faced the Qibla and performed two prostrations and then pronounced salutations, and then turned his face towards us and said: If there is anything new about prayer (new command from the Lord) I informed you of that. But I am a human being and I forget as you for. get, so when I forget, remind me, and when any one of you is in doubt about his prayer. he should aim at what Is correct. and complete his prayer in that respect and then make two prostrations.  

عَبْدُ اللَّهِ صَلَّى رَسُولُ اللَّهِ ﷺ قَالَ إِبْرَاهِيمُ زَادَ أَوْ نَقَصَ فَلَمَّا سَلَّمَ قِيلَ لَهُ يَا رَسُولَ اللَّهِ أَحَدَثَ فِي الصَّلاَةِ شَىْءٌ قَالَ وَمَا ذَاكَ قَالُوا صَلَّيْتَ كَذَا وَكَذَا قَالَ فَثَنَى رِجْلَيْهِ وَاسْتَقْبَلَ الْقِبْلَةَ فَسَجَدَ سَجْدَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ أَقْبَلَ عَلَيْنَا بِوَجْهِهِ فَقَالَ إِنَّهُ لَوْ حَدَثَ فِي الصَّلاَةِ شَىْءٌ أَنْبَأْتُكُمْ بِهِ وَلَكِنْ إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَإِذَا نَسِيتُ فَذَكِّرُونِي وَإِذَا شَكَّ أَحَدُكُمْ فِي صَلاَتِهِ فَلْيَتَحَرَّ الصَّوَابَ فَلْيُتِمَّ عَلَيْهِ ثُمَّ لْيَسْجُدْ سَجْدَتَيْنِ  

The Messenger of Allah ﷺ said prayer and he omitted or committed (something). Ibrahim (one of the narrators of this hadith) said: It is my doubt, and it was said: Messenger of Allah, has there been any addition to the prayer? He (the Holy Prophet) said: Verily I am a human being like you. I forget just as you forget so when any one of you forgets, he must perform two prostrations, and he (the Holy Prophet) was sitting and then the Messenger of Allah ﷺ turned (his face towards the Qibla) and performed two prostrations.  

صَلَّى رَسُولُ اللَّهِ ﷺ فَزَادَ أَوْ نَقَصَ قَالَ إِبْرَاهِيمُ وَالْوَهْمُ مِنِّي فَقِيلَ يَا رَسُولَ اللَّهِ أَزِيدَ فِي الصَّلاَةِ شَىْءٌ فَقَالَ إِنَّمَا أَنَا بَشَرٌ مِثْلُكُمْ أَنْسَى كَمَا تَنْسَوْنَ فَإِذَا نَسِيَ أَحَدُكُمْ فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ ثُمَّ تَحَوَّلَ رَسُولُ اللَّهِ ﷺ فَسَجَدَ سَجْدَتَيْنِ  

“The Messenger of Allah ﷺ prayed, and he added or omitted something.” (One of the narrators) Ibrahim said: “The confusion stems from me (i.e., he was not sure which it was).” “It was said to him: ‘O Messenger of Allah! Has something been added to the prayer?’ He said: ‘I am only human, I forget just as you forget. If anyone forgets, let him perform two prostrations when he is sitting (at the end).’ Then the Prophet ﷺ turned and prostrated twice.”  

صَلَّى رَسُولُ اللَّهِ ﷺ فَزَادَ أَوْ نَقَصَ قَالَ إِبْرَاهِيمُ وَالْوَهْمُ مِنِّي فَقِيلَ لَهُ يَا رَسُولَ اللَّهِ أَزِيدَ فِي الصَّلاَةِ شَىْءٌ قَالَ إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَإِذَا نَسِيَ أَحَدُكُمْ فَلْيَسْجُدْ سَجْدَتَيْنِ وَهُوَ جَالِسٌ ثُمَّ تَحَوَّلَ النَّبِيُّ ﷺ فَسَجَدَ سَجْدَتَيْنِ  

We prayed along with the Messenger of Allah (may peace he upon him) and he committed or omitted (something). Ibrahim said: By Allah, this is a misgiving of mine only. We said: Messenger of Allah, is there something new about the prayer? He (the Holy Prophet) said: No. We told him about what he had done. He (the Holy Prophet) said: When a man commits or omits (something in prayer), he should perform two prostrations, and he then himself performed two prostrations. (Using translation from Muslim 572n)  

صَلَّيْنَا مَعَ رَسُولِ اللهِ ﷺ فَإِمَّا زَادَ أَوَ نَقَصَ قَالَ إِبْرَاهِيمُ وَايْمُ اللهِ مَا جَاءَ ذَلِكَ إِلَّا مِنْ قِبَلِي فَقُلْنَا يَا رَسُولَ اللهِ أَحَدَثَ فِي الصَّلَاةِ شَيْءٌ؟ قَالَ «لَا» فَقُلْنَا لَهُ الَّذِي صَنَعَ قَالَ «إِذَا زَادَ الرَّجُلُ أَوَ نَقَصَ فَلْيَسْجُدْ سَجْدَتَيْنِ» قَالَ ثُمَّ سَجَدَ سَجْدَتَيْنِ  

[Machine] He said, may the Messenger of Allah ﷺ, prayed Dhuhr or Asr. When he finished his prayer, he was told, "O Messenger of Allah, did you add anything in the prayer?" He replied, "What is the matter with you?" They said, "You prayed five (units) instead of four." So, he faced the qibla and performed two prostrations. Then he said, "I am only a human being, and I forget just as you forget. So when one of you becomes doubtful in his prayer, let him perform two prostrations."  

أَنَّهُ قَالَ صَلَّى رَسُولُ اللهِ ﷺ الظُّهْرَ أَوَ الْعَصْرَ فَلَمَّا قَضَى صَلَاتَهُ قِيلَ يَا رَسُولَ اللهِ أَحَدَثَ فِي الصَّلَاةِ حَدَثٌ؟ قَالَ «وَمَا ذَاكُمْ؟» قَالُوا صَلَّيْتَ خَمْسًا فَاسْتَقْبَلَ الْقِبْلَةَ فَسَجَدَ سَجْدَتَيْنِ ثُمَّ قَالَ «إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَإِذَا وَهِمَ أَحَدُكُمْ فِي صَلَاتِهِ فَلْيَسْجُدْ سَجْدَتَيْنِ»