Leviticus 25:40; Leviticus 25:46

40 But as an hired servant, and as a sojourner, he shall be with thee, and shall serve thee unto the year of jubile:
46 And ye shall take them as an inheritance for your children after you, to inherit them for a possession; they shall be your bondmen for ever: but over your brethren the children of Israel, ye shall not rule one over another with rigour.
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