Leviticus 25:40-42

⁴⁰But he shall be as a hireling, and a sojourner: he shall work with thee until the year of the jubilee,

⁴¹And afterwards he shall go out with his children, and shall return to his kindred and to the possession of his fathers,

⁴²For they are my servants, and I brought them out of the land of Egypt: let them not be sold as bondmen: