"The Messenger of Allah ﷺ prayed and did more or less (rak'ahs). When he had said the taslim, it was said: 'O Messenger of Allah, has there been some change concerning the prayer?' He said: 'If there had been some change concerning the prayer, I would have told you. Rather I am a human being and I forget as you forget. If any one of you is not sure about his prayer, let him consider an estimate of what is correct, and complete his prayer on that basis, then say the taslim and prostrate twice.'"  

صَلَّى رَسُولُ اللَّهِ ﷺ فَزَادَ أَوْ نَقَصَ فَلَمَّا سَلَّمَ قُلْنَا يَا رَسُولَ اللَّهِ هَلْ حَدَثَ فِي الصَّلاَةِ شَىْءٌ قَالَ لَوْ حَدَثَ فِي الصَّلاَةِ شَىْءٌ أَنْبَأْتُكُمُوهُ وَلَكِنِّي إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَأَيُّكُمْ مَا شَكَّ فِي صَلاَتِهِ فَلْيَنْظُرْ أَحْرَى ذَلِكَ إِلَى الصَّوَابِ فَلْيُتِمَّ عَلَيْهِ ثُمَّ لْيُسَلِّمْ وَلْيَسْجُدْ سَجْدَتَيْنِ  

“The Messenger of Allah ﷺ offered prayer, and I am not sure whether he did something extra or omitted something. He asked, and we told him, so he turned to face the Qiblah and prostrated twice, then he said the Salam. Then he turned to face us and said: ‘If any new command has been revealed concerning the prayer, I would certainly have told you. But I am only human and I forget and you forget. If I forget, then remind me. And if anyone of you is uncertain about the prayer, let him do what is closest to what is correct, then complete the prayer, say the Salam and prostrate twice.”  

صَلَّى رَسُولُ اللَّهِ ﷺ صَلاَةً لاَ يَدْرِي أَزَادَ أَوْ نَقَصَ فَسَأَلَ فَحَدَّثْنَاهُ فَثَنَى رِجْلَهُ وَاسْتَقْبَلَ الْقِبْلَةَ وَسَجَدَ سَجْدَتَيْنِ ثُمَّ سَلَّمَ ثُمَّ أَقْبَلَ عَلَيْنَا بِوَجْهِهِ فَقَالَ لَوْ حَدَثَ فِي الصَّلاَةِ شَىْءٌ لأَنْبَأْتُكُمُوهُ وَإِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَإِذَا نَسِيتُ فَذَكِّرُونِي وَأَيُّكُمْ مَا شَكَّ فِي الصَّلاَةِ فَلْيَتَحَرَّ أَقْرَبَ ذَلِكَ مِنَ الصَّوَابِ فَيُتِمَّ عَلَيْهِ وَيُسَلِّمَ وَيَسْجُدَ سَجْدَتَيْنِ  

[Machine] The Messenger of Allah ﷺ said: "I am only a human being, and I forget just as you forget. So, whoever has any doubts in his prayer should consider what is most correct, complete it and then perform two prostrations."  

قَالَ رَسُولُ اللهِ ﷺ إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَأَيُّكُمْ مَا شَكَّ فِي صَلَاتِهِ فَلْيَنْظُرْ أَحْرَى ذَلِكَ الصَّوَابَ فَلْيُتِمَّ عَلَيْهِ وَيَسْجُدْ سَجْدَتَيْنِ  

"The Messenger of Allah ﷺ prayed and did more or less (rak'ahs). When he had said the taslim, it was said: 'O Messenger of Allah, has there been some change concerning the prayer?' He said: 'If there had been some change concerning the prayer, I would have told you. Rather I am a human being and I forget as you forget. If any one of you is not sure about his prayer, let him consider an estimate of what is correct, and complete his prayer on that basis, then say the taslim and prostrate twice.'" (Using translation from Nasāʾī 1242)   

صَلَّى رَسُولُ اللَّهِ ﷺ فَزَادَ أَوْ نَقَصَ فَقِيلَ لَهُ يَا رَسُولَ اللَّهِ هَلْ حَدَثَ فِي الصَّلَاةِ شَيْءٌ؟ قَالَ «لَوْ حَدَثَ شَيْءٌ لَنَبَّأْتُكُمُوهُ وَلَكِنْ إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَأَيُّكُمْ شَكَّ فِي صَلَاتِهِ فَلْيَنْظُرْ أَحْرَى ذَلِكَ إِلَى الصَّوَابِ فَلْيُتِمَّ عَلَيْهِ ثُمَّ يَقُومُ فَلْيَسْجُدْ سَجْدَتَيْنِ»  

"The Messenger of Allah ﷺ prayed and did more or less (rak'ahs). When he had said the taslim, it was said: 'O Messenger of Allah, has there been some change concerning the prayer?' He said: 'If there had been some change concerning the prayer, I would have told you. Rather I am a human being and I forget as you forget. If any one of you is not sure about his prayer, let him consider an estimate of what is correct, and complete his prayer on that basis, then say the taslim and prostrate twice.'" (Using translation from Nasāʾī 1242)   

صَلَّى بِنَا رَسُولُ اللَّهِ ﷺ فَزَادَ أَوْ نَقَصَ وَقِيلَ يَا رَسُولَ اللَّهِ هَلْ حَدَثَ فِي الصَّلَاةِ شَيْءٌ؟ فَقَالَ ﷺ «لَوْ حَدَثَ شَيْءٌ لَنَبَّأْتُكُمُوهُ وَلَكِنِّي إِنَّمَا أَنَا بَشَرٌ أَنْسَى كَمَا تَنْسَوْنَ فَأَيُّكُمْ شَكَّ فِي صَلَاتِهِ فَلْيَنْظُرْ أَحْرَى ذَلِكَ إِلَى الصَّوَابِ وَلْيُتِمَّ عَلَيْهِ ثُمَّ لْيُسَلِّمْ وَلْيَسْجُدْ سَجْدَتَيْنِ»  

"إِنَّه لوْ حَدَث في الصَّلاةِ شئٌ لنبَّأتُكُم به وَلكن إِنَّما أنا بشرٌ مثلُكُمْ أنْسَى كمَا تنْسَون، فإِذا نسيتُ فذكِّرُونى، وإِذا شكَّ أحدُكمْ في صلاته فليتَحَرَّ الصَّواب فليُتمَّ عليه ثُمَّ ليُسَلمْ ثُمَّ ليسجدْ سَجدتين".