Leviticus 25:39-41

‘And if your fellow countryman becomes so poor [in his dealings] with you that he sells himself to you [as payment for a debt], you shall not let him do the work of a slave [who is ineligible for redemption], but he is to be with you as a hired man, as if he were a temporary resident; he shall serve with you until the Year of Jubilee, and then he shall leave you, he and his children with him, and shall go back to his own family and return to the property of his fathers.