Sahih Muslim 1285
صحيح مسلم#1285Sahihوَحَدَّثَنَا مِنْجَابُ بْنُ الْحَارِثِ التَّمِيمِيُّ، أَخْبَرَنَا ابْنُ مُسْهِرٍ، عَنِ الأَعْمَشِ، عَنْ إِبْرَاهِيمَ، عَنْ عَلْقَمَةَ، عَنْ عَبْدِ اللَّهِ، قَالَ صَلَّى رَسُولُ اللَّهِ صلى الله عليه وسلم 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 صلى الله عليه وسلم فَسَجَدَ سَجْدَتَيْنِ .
Abdullah (b. Mas'ud) reported: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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 5:123