Leviticus 25:46

25:46 You may make them an inheritance for your children after you, to hold for a possession; of them may you take your slaves forever: but over your brothers the children of Israel you shall not rule, one over another, with harshness.
-World English Bible

Other Translation

25:46 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.
-King James Version