Sahih al-Bukhari 1835
صحيح البخاري#1835Sahihحَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا سُفْيَانُ، قَالَ قَالَ عَمْرٌو أَوَّلُ شَىْءٍ سَمِعْتُ عَطَاءً، يَقُولُ سَمِعْتُ ابْنَ عَبَّاسٍ ـ رضى الله عنهما ـ يَقُولُ احْتَجَمَ رَسُولُ اللَّهِ صلى الله عليه وسلم وَهُوَ مُحْرِمٌ. ثُمَّ سَمِعْتُهُ يَقُولُ حَدَّثَنِي طَاوُسٌ عَنِ ابْنِ عَبَّاسٍ فَقُلْتُ لَعَلَّهُ سَمِعَهُ مِنْهُمَا.
Narrated Ibn `Abbas:Allah's Messenger (ﷺ) was cupped while he was in a state of Ihram
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: 28:15