Leviticus 25:40-42

⁴⁰As a hired servant, and as a sojourner, he shall be with thee; he shall serve with thee unto the year of jubilee:

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

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