Leviticus 25:44-46

⁴⁴Both thy bond-men, and thy bond-maids, which thou shalt have, shall be of the heathen that are around you; of them shall ye buy bond-men and bond-maids.

⁴⁵Moreover of the children of the strangers that sojourn among you, of them shall ye buy, and of their families that are with you, which they begat in your land: and they shall be your possession.

⁴⁶And ye shall take them as an inheritance for your children after you, to inherit them for a possession, they shall be your bond-men for ever: but over your brethren the children of Israel, ye shall not rule one over another with rigor.