By our Shaykh, the 'Allāmah, the Trustworthy Advisor, Abū 'Abdirrahmān Yahya bin 'Alī Al-Hajūri - may Allāh preserve him -
وَحَدَّثَنَا عُثْمَانُ، وَأَبُو بَكْرٍ ابْنَا أَبِي شَيْبَةَ وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ جَمِيعًا عَنْ جَرِيرٍ، - قَالَ عُثْمَانُ حَدَّثَنَا جَرِيرٌ، - عَنْ مَنْصُورٍ، عَنْ إِبْرَاهِيمَ، عَنْ عَلْقَمَةَ، قَالَ قَالَ عَبْدُ اللَّهِ صَلَّى رَسُولُ اللَّهِ صلى الله عليه وسلم - 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 " .
89 - (572) Uthmān, Abu Bakr Ibn Abi Shaibah and Ishāq bin Ibrāhīm narrated to us on the authority of Jarīr - Uthmān said: Jarīr narrated to us on the authority of Mansūr, on the authority of Ibrāhīm, on the authority of Alqamah, he siad: Abdullāh (Ibn Mas'ūd) said: "The Messenger of Allāh ﷺ prayed and made salutations ~ Ibrāhīm said: "He made an addition or an omission" ~ so when he made the salutations it was said to him: "O Messenger of Allāh, has there occurred something new in the prayer? He said: "And what is that? They said: "You prayed such and such (amount)." He (the narrator) said: "So he turned his feet and faced the Qiblah and performed two prostrations and then made the salutations, and then turned and faced towards us and said: "Indeed if something new in the prayer occurs, I would inform you of it. But verily I am a human being and I forget as you forget, so if I forget, remind me, and if any of you is in doubt in his prayer, then let him struggle to remember what is correct, and complete his prayer upon that and then make two prostrations."
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
"So when he made the salutations it was said to him: "O Messenger of Allāh, has there occurred something new in the prayer? He said: "And what is that? They said: "You prayed such and such (amount)." He (the narrator) said: "So he turned his feet and faced the Qiblah and made two prostrations and then made the salutations."