Leviticus 25:43-45

⁴³Thou shalt not rule over him with rigor; but thou shalt have fear of thy God.

⁴⁴But thy bond-man, and thy bond-woman that shall remain thine, shall be of the nations that are round about you; of them may ye buy bond-man and bond-woman.

⁴⁵And also of the children of the strangers that sojourn with you, of them may ye buy, and of their families that are with you, which they have begotten in your land; and they shall remain to you as a possession.