Leviticus 25:27, 51-52

then let him count the years since its sale, and restore the remainder to the man to whom he sold it, that he may return to his possession.

If there are still many years remaining, according to them he shall repay the price of his redemption from the money with which he was bought. And if there remain but a few years until the Year of Jubilee, then he shall reckon with him, and according to his years he shall repay him the price of his redemption.