Leviticus 25:37-41

³⁷You must not give him a loan of money and charge interest, nor sell him your food to earn a profit.

³⁸I am Yahweh your God, who brought you out of the land of Egypt, in order that I might give you the land of Canaan, and that I might be your God.

³⁹If your fellow countryman has become poor and sells himself to you, you must not make him work like a slave.

⁴⁰Treat him as a hired servant. He must be like someone living temporarily with you. He will serve with you until the year of Jubilee.

⁴¹Then he will go away from you, he and his children with him, and he will return to his own family and to his fathers' property.