Leviticus 25:43-45

New Revised Standard Version, Anglicised

⁴³ You shall not rule over them with harshness, but shall fear your God. ⁴⁴ As for the male and female slaves whom you may have, it is from the nations around you that you may acquire male and female slaves. ⁴⁵ You may also acquire them from among the aliens residing with you, and from their families that are with you, who have been born in your land; and they may be your property.