Leviticus 25:46

25:46 You may give them as inheritance to your children after you to possess as property. You may enslave them perpetually. However, as for your brothers the Israelites, no man may rule over his brother harshly. ¹ 

[25:46]  ¹ tn Heb “and your brothers, the sons of Israel, a man in his brother you shall not rule in him in violence.”