Sahih Muslim 5553
صحيح مسلم#5553SahihIbn Abbas reported that Allah's Messenger (ﷺ) saw an ass which had been cauterised on the face. He disapproved of it saying:By Allah, I do not cauterise (the animal) but on a part at a distance from the face, and commanded (for the cauterisation) of his ass and it was cauterised on the buttocks and he was the first to cauterise on the buttocks
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 37:164