Sahih al-Bukhari 830
صحيح البخاري#830Sahihحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، قَالَ حَدَّثَنَا بَكْرٌ، عَنْ جَعْفَرِ بْنِ رَبِيعَةَ، عَنِ الأَعْرَجِ، عَنْ عَبْدِ اللَّهِ بْنِ مَالِكٍ ابْنِ بُحَيْنَةَ، قَالَ صَلَّى بِنَا رَسُولُ اللَّهِ صلى الله عليه وسلم الظُّهْرَ فَقَامَ وَعَلَيْهِ جُلُوسٌ، فَلَمَّا كَانَ فِي آخِرِ صَلاَتِهِ سَجَدَ سَجْدَتَيْنِ وَهْوَ جَالِسٌ.
Narrated `Abdullah bin Malik bin Buhaina:Once Allah's Messenger (ﷺ) led us in the Zuhr prayer and got up (after the prostrations of the second rak`a) although he should have sat (for the Tashahhud). So at the end of the prayer, he prostrated twice while sitting (prostrations of Sahu)
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 al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 10:224