Sahih al-Bukhari 4227
صحيح البخاري#4227Sahihحَدَّثَنِي مُحَمَّدُ بْنُ أَبِي الْحُسَيْنِ، حَدَّثَنَا عُمَرُ بْنُ حَفْصٍ، حَدَّثَنَا أَبِي، عَنْ عَاصِمٍ، عَنْ عَامِرٍ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ لاَ أَدْرِي أَنَهَى عَنْهُ رَسُولُ اللَّهِ صلى الله عليه وسلم مِنْ أَجْلِ أَنَّهُ كَانَ حَمُولَةَ النَّاسِ، فَكَرِهَ أَنْ تَذْهَبَ حَمُولَتُهُمْ، أَوْ حَرَّمَهُ فِي يَوْمِ خَيْبَرَ، لَحْمَ الْحُمُرِ الأَهْلِيَّةِ.
Narrated Ibn `Abbas:I do not know whether the Prophet (ﷺ) forbade the eating of donkey-meat (temporarily) because they were the beasts of burden for the people, and he disliked that their means of transportation should be lost, or he forbade it on the day of Khaibar permanently
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: 64:265