Leviticus 27:16-21
If anyone consecrates to the Lord any land that he holds, its assessment shall be in accordance with its seed requirement: fifty shekels of silver to a homer of barley seed. If he consecrates his land as of the jubilee year, its assessment stands. But if he consecrates his land after the jubilee, the priest shall compute the price according to the years that are left until the jubilee year, and its assessment shall be so reduced; and if he who consecrated the land wishes to redeem it, he must add one-fifth to the sum at which it was assessed, and it shall pass to him. But if he does not redeem the land, and the land is sold to another, it shall no longer be redeemable: when it is released in the jubilee, the land shall be holy to the Lord, as land proscribed; it becomes the priest's holding.