Leviticus 25:48-52

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 near of kin to him of his family may redeem him; or if he is able, he may redeem himself. 50And he shall reckon with him that bought him from the year that he was sold to him to the year of jubilee: and the price of his sale shall be according to the number of years, according to the time of an hired servant shall it be with him. 51If there shall be yet many years behind, according to them he shall give again the price of his redemption out of the money that he was bought for. 52And if there shall remain but few years to the year of jubilee, then he shall count with him, and according to his years shall he give him again the price of his redemption.