(29) باب النَّهْىِ عَنْ ضَرْبِ الْحَيَوَانِ، فِي وَجْهِهِ وَوَسْمِهِ فِيهِ .
Ibn 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.
Reference: Sahih Muslim 2118
In-book reference: Book 37, Hadith 164
USC-MSA web (English) reference(deprecated numbering scheme): Book 24, Hadith 5284