Leviticus 25:39-43

“ ‘If anyone from your country becomes very poor and sells himself as a slave to you, you must not make him work like a slave. He will be like a hired worker and a visitor with you until the year of Jubilee. Then he may leave you, take his children, and go back to his family and the land of his ancestors. This is because the Israelites are my servants, and I brought them out of slavery in Egypt. They must not become slaves again. You must not rule this person cruelly, but you must respect your God.