Leviticus 25:46-49

⁴⁶And ye shall take them as an inheritance for your children after you, to inherit them for a possession, they shall be your bond-men for ever: but over your brethren the children of Israel, ye shall not rule one over another with rigor.

⁴⁷And if a sojourner or a stranger shall become rich by thee, and thy brother that dwelleth by him shall become poor, and sell himself to the stranger or sojourner by thee, or to the stock of the stranger's family:

⁴⁸After that he is sold he may be redeemed again; one of his brethren may redeem him:

⁴⁹Either his uncle, or his uncle's son may redeem him, or any that is nigh of kin to him of his family, may redeem him; or if he is able, he may redeem himself.