(29) باب النَّهْىِ عَنْ ضَرْبِ الْحَيَوَانِ، فِي وَجْهِهِ وَوَسْمِهِ فِيهِ .
Jabir reported that there happened to pass before Allah's Apostle (ﷺ) an ass the face of which had been cauterised, whereupon he said:
Allah has cursed one who has cauterised it (on the face).
Reference: Sahih Muslim 2117
In-book reference: Book 37, Hadith 163
USC-MSA web (English) reference(deprecated numbering scheme): Book 24, Hadith 5283