Exodus 21:20, 26-27

“If a man beats his male or female slave with a club and the slave dies as a result, the owner must be punished.

“If a man hits his male or female slave in the eye and the eye is blinded, he must let the slave go free to compensate for the eye. And if a man knocks out the tooth of his male or female slave, he must let the slave go free to compensate for the tooth.