Sahih al-Bukhari 4459
صحيح البخاري#4459Sahihحَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، أَخْبَرَنَا أَزْهَرُ، أَخْبَرَنَا ابْنُ عَوْنٍ، عَنْ إِبْرَاهِيمَ، عَنِ الأَسْوَدِ، قَالَ ذُكِرَ عِنْدَ عَائِشَةَ أَنَّ النَّبِيَّ صلى الله عليه وسلم أَوْصَى إِلَى عَلِيٍّ، فَقَالَتْ مَنْ قَالَهُ لَقَدْ رَأَيْتُ النَّبِيَّ صلى الله عليه وسلم وَإِنِّي لَمُسْنِدَتُهُ إِلَى صَدْرِي، فَدَعَا بِالطَّسْتِ فَانْخَنَثَ فَمَاتَ، فَمَا شَعَرْتُ، فَكَيْفَ أَوْصَى إِلَى عَلِيٍّ
Narrated Al-Aswad:It was mentioned in the presence of `Aisha that the Prophet (ﷺ) had appointed `Ali as successor by will. Thereupon she said, "Who said so? I saw the Prophet, while I was supporting him against my chest. He asked for a tray, and then fell on one side and expired, and I did not feel it. So how (do the people say) he appointed `Ali as his successor?
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: 64:475