Leviticus 25:51-53

American Standard Version

⁵¹ If there be yet many years, according unto them he shall give back the price of his redemption out of the money that he was bought for. ⁵² And if there remain but few years unto the year of jubilee, then he shall reckon with him; according unto his years shall he give back the price of his redemption. ⁵³ As a servant hired year by year shall he be with him: he shall not rule with rigor over him in thy sight.