It is narrated from Sayyiduna Imran bin Husayn (may Allah be pleased with him) that a man bit another man's hand; he pulled his hand away from him and both of his front teeth fell out. He came to the Prophet (peace and blessings be upon him), "and he (peace and blessings be upon him) declared it void," then he said: "Does one of you eat his brother's flesh the way a male camel eats, or the way a male camel bites?"
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15625