Leviticus 25:45 WEB

⁴³  You shall not rule over him with harshness, but shall fear your God.

⁴⁴  ''As for your male and your female slaves, whom you may have; of the nations that are around you, from them you may buy male and female slaves.

⁴⁵  Moreover of the children of the strangers who sojourn among you, of them you may buy, and of their families who are with you, which they have conceived in your land; and they will be your property.

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.

⁴⁷  ''If a stranger or sojourner with you becomes rich, and your brother beside him has grown poor, and sells himself to the stranger or foreigner living among you, or to a member of the stranger's family;