Leviticus 25:40-42

⁴⁰But as a hired laborer, as a sojourner, shall he be with thee; until the year of the jubilee shall he serve with thee:

⁴¹And then shall he depart from thee, he and his children with him; and he shall return unto his own family, and unto the possession of his fathers shall he return.

⁴²For my servants are they, whom I brought forth out of the land of Egypt: they shall not be sold as bond-men are sold.