(38) باب غَزْوَةُ خَيْبَرَ
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.
Reference: Sahih al-Bukhari 4227
In-book reference: Book 64, Hadith 265
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 59, Hadith 536