Leviticus 25:53-55

⁵³As a servant hired year by year shall he be with him. He shall not rule with harshness over him in your sight.

⁵⁴If he isn’t redeemed by these means, then he shall be released in the Year of Jubilee: he and his children with him.

⁵⁵For to me the children of Israel are servants; they are my servants whom I brought out of the land of Egypt. I am Yahweh your God.