Leviticus 25:39-41, 44

“ ‘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.

“ ‘Your men and women slaves must come from other nations around you; from them you may buy slaves.