Sahih al-Bukhari 4976
صحيح البخاري#4976Sahihحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا سُفْيَانُ، عَنْ عَاصِمٍ، وَعَبْدَةَ، عَنْ زِرِّ بْنِ حُبَيْشٍ، قَالَ سَأَلْتُ أُبَىَّ بْنَ كَعْبٍ عَنِ الْمُعَوِّذَتَيْنِ، فَقَالَ سَأَلْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم فَقَالَ قِيلَ لِي فَقُلْتُ فَنَحْنُ نَقُولُ كَمَا قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم.
Narrated Zirr bin Hubaish:I asked Ubai bin Ka`b regarding the two Muwwidhat (Surats of taking refuge with Allah). He said, "I asked the Prophet (ﷺ) about them, He said, 'These two Surats have been recited to me and I have recited them (and are present in the Qur'an).' So, we say as Allah's Messenger (ﷺ) said (i.e., they are part of the Qur'an)
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: 65:498