Safwan bin Ya'la narrates from his father: I participated in the Battle of Tabuk with the Prophet Muhammad (peace be upon him). In this battle, I gave a young camel in the way of Allah, which I considered my best deed. I had employed a man, and he got into a fight with another person. He bit the other person's hand, so the second man pulled his hand out of his mouth, causing the first man's front teeth to fall out. He came to the Prophet Muhammad (peace be upon him), and the Prophet (peace be upon him) said: "Would he have left his hand in your mouth so that you could chew it like a camel chews?" So the Prophet (peace be upon him) declared his loss void.