(35) باب الْوَسْمِ وَالْعَلَمِ فِي الصُّورَةِ
Narrated Anas:
I brought a brother of mine to the Prophet (ﷺ) to do Tahnik for him while the Prophet (ﷺ) was in a sheep fold of his, and I saw him branding a sheep. (The sub-narrator said: I think Anas said, branding it on the ear.)
Reference: Sahih al-Bukhari 5542
In-book reference: Book 72, Hadith 68
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 7, Book 67, Hadith 450