Leviticus 25:53-55

⁵³As a servant hired year by year shall he be with him; he shall not rule with rigour over him in thy sight.

⁵⁴And if he be not redeemed by any of these means, then he shall go out in the year of jubilee, 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.