Then the priest shall reckon unto him the worth of thy estimation, even unto the year of the jubile: and he shall give thine estimation in that day, as a holy thing unto the LORD.
Leviticus 27:12
And the priest shall value it, whether it be good or bad: as thou valuest it, who art the priest, so shall it be.
Leviticus 27:18
But if he sanctify his field after the jubile, then the priest shall reckon unto him the money according to the years that remain, even unto the year of the jubile, and it shall be abated from thy estimation.