Leviticus 25:39-43

39And if thy brother grow poor beside thee, and be sold unto thee, thou shalt not compel him to serve as a bondservant:

40as a hired servant, as a sojourner, shall he be with thee; until the year of jubilee shall he serve thee.

41Then shall he depart 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 bondmen, whom I brought forth out of the land of Egypt: they shall not be sold as [men] sell bondmen.

43Thou shalt not rule over him with rigour; and thou shalt fear thy 1God.