Leviticus 25:49

46 You may make them an inheritance for your children after you, to hold for a possession. Of them you may take your slaves forever, but over your brothers the children of Israel you shall not rule, one over another, with harshness.

47 “‘If an alien or temporary resident with you becomes rich, and your brother beside him has grown poor, and sells himself to the stranger or foreigner living among you, or to a member of the stranger’s family,

48 after he is sold he may be redeemed. One of his brothers may redeem him;

49 or his uncle, or his uncle’s son, may redeem him, or any who is a close relative to him of his family may redeem him; or if he has grown rich, he may redeem himself.

50 He shall reckon with him who bought him from the year that he sold himself to him to the Year of Jubilee. The price of his sale shall be according to the number of years; he shall be with him according to the time of a hired servant.

51 If there are yet many years, according to them he shall give back the price of his redemption out of the money that he was bought for.

52 If there remain but a few years to the year of jubilee, then he shall reckon with him; according to his years of service he shall give back the price of his redemption.