Vayikra 25:50-51

Orthodox Jewish Bible

⁵⁰ And he shall reckon with him that bought him from the year that he was sold to him unto the Shnat HaYovel; and the price of his release shall be based on the number of shanim, according to the value of a sakhir’s pay shall it be with him.

⁵¹ If there be yet many shanim remaining, according unto them he shall give for his Geulah the kesef that he was bought for.