Safwan bin Ya'la narrates from his father: A man came to the service of the Prophet Muhammad (peace be upon him). He had bitten another person's hand, and the other person pulled his hand away, causing the front teeth of the one who bit to break. The narrator states that the Prophet Muhammad (peace be upon him) declared it void. The Prophet (peace be upon him) said: Did you want him to let you chew it as a camel chews?