Leviticus 25:45-47

Amplified Bible

⁴⁵ Moreover, from the children of the strangers who live as aliens among you, from them you may buy slaves and from their families who are with you, whom they have produced in your land; they may become your possession. ⁴⁶ You may even bequeath them as an inheritance to your children after you, to receive as a possession; you can use them as permanent slaves. But in respect to your fellow countrymen, the children of Israel, you shall not rule over one another with harshness (severity, oppression).

Of Redeeming a Poor Man

⁴⁷ ‘Now if the financial means of a stranger or temporary resident among you become sufficient, and your fellow countryman becomes poor in comparison to him and sells himself to the stranger who is living among you or to the descendants of the stranger’s family,