Leviticus 25:48-52

48after he has sold himself he retains a right of redemption. One of his brothers may redeem him,

49or his uncle or his cousin may redeem him, or anyone of the rest of his blood relatives – his family – may redeem him, or if he prospers he may redeem himself.

50He must calculate with the one who bought him the number of years from the year he sold himself to him until the jubilee year, and the cost of his sale must correspond to the number of years, according to the rate of wages a hired worker would have earned while with him.

51If there are still many years, in keeping with them he must refund most of the cost of his purchase for his redemption,

52but if only a few years remain until the jubilee, he must calculate for himself in keeping with the remaining years and refund it for his redemption.