Leviticus 25:47-49

And if a stranger or sojourner with thee be waxed rich, and thy brother be waxed poor beside him, and sell himself unto the stranger or sojourner with thee, or to the stock of the stranger’s family; after that he is sold he may be redeemed: one of his brethren may redeem him; or his uncle, or his uncle’s son, may redeem him, or any that is nigh of kin unto him of his family may redeem him; or if he be waxed rich, he may redeem himself.