Leviticus 25:39-40

³⁹If thy brother compelled by poverty selleth himself to thee, thou shalt not oppress him by servage of servants (or thou shalt not make him thy slave),

⁴⁰but he shall be as an hired man and (as) a tenant; till to the year of jubilee he shall work with thee (or he shall work for thee until the Jubilee Year),