Leviticus 25:53-55

⁵³And as a yearly hired servant shall he be with him: and the other shall not rule with rigour over him in thy sight.

⁵⁴And if he be not redeemed in these years, then he shall go out in the year of jubile, both he, and his children with him.

⁵⁵For unto me the children of Israel are servants; they are my servants whom I brought forth out of the land of Egypt: I am the LORD your God.