Leviticus 25:39-40

25:39 “‘If your brother becomes impoverished with regard to you so that he sells himself to you, you must not subject him to slave service. 25:40 He must be with you as a hired worker, as a resident foreigner; he must serve with you until the year of jubilee,

Leviticus 25:43

25:43 You must not rule over him harshly, but you must fear your God.