Exodus 21:27
And if he smite out his manservant’s tooth, or his maidservant’s tooth; he shall let him go free for his tooth’s sake. And if he smite out his manservant’s tooth, or his maidservant’s tooth; he shall let him go free for his tooth’s sake.
If a master knocks out his manservant's tooth or his maidservant's tooth, he is required to let that servant go free for the tooth's sake, with freedom given as compensation for the injury. Even the loss of a tooth alone was enough to require release, because any injury done to a servant's person entitled that servant to freedom. This safeguard was not confined to Israelite servants but reached also to servants who were not Israelites.
This requirement stands as a law against injustice in dealings with servants, guarding the interests of God's people including the poor. It reveals impartial concern for the injured person and an exalted standard of justice.