سنن أبي داود

Narrated Safwan b. Ya'la: On this father's authority, said: A servant of mine fought with a man and bit his hand and he drew away his hand. (One of) his front teeth fell out. So he came to the Prophet (ﷺ) who imposed no retaliation for his tooth, saying: Do you intend that he leaves his hand in your mouth so that you crunch it like a male camel ? He said: Ibn Abi Mulaikah told me on the authority of his grandfather that Abu Bakr (ra) imposed no retaliation on him for it, saying: May his tooth go away!