Sahih al-Bukhari 4977
صحيح البخاري#4977Sahihحَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، حَدَّثَنَا عَبْدَةُ بْنُ أَبِي لُبَابَةَ، عَنْ زِرِّ بْنِ حُبَيْشٍ، وَحَدَّثَنَا عَاصِمٌ، عَنْ زِرٍّ، قَالَ سَأَلْتُ أُبَىَّ بْنَ كَعْبٍ قُلْتُ يَا أَبَا الْمُنْذِرِ إِنَّ أَخَاكَ ابْنَ مَسْعُودٍ يَقُولُ كَذَا وَكَذَا. فَقَالَ أُبَىٌّ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ لِي قِيلَ لِي. فَقُلْتُ، قَالَ فَنَحْنُ نَقُولُ كَمَا قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم.
Narrated Zirr bin Hubaish:I asked Ubai bin Ka`b, "O Abu AlMundhir! Your brother, Ibn Mas`ud said so-and-so (i.e., the two Mu'awwidh-at do not belong to the Qur'an)." Ubai said, "I asked Allah's Messenger (ﷺ) about them, and he said, 'They have been revealed to me, and I have recited them (as a part of the Qur'an)," So Ubai added, "So we say as Allah's Messenger (ﷺ) has said
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: 65:499