Leviticus 27:22

If he who dedicated the field will indeed redeem it, then he shall add the fifth part of the money of your valuation to it, and it shall remain his.

If he will not redeem the field, or if he has sold the field to another man, it shall not be redeemed any more;

but the field, when it goes out in the Jubilee, shall be holy to the LORD, as a devoted field. It shall be owned by the priests.

then the priest shall reckon to him the worth of your valuation up to the Year of Jubilee; and he shall give your valuation on that day, as a holy thing to the LORD.

In the Year of Jubilee the field shall return to him from whom it was bought, even to him to whom the possession of the land belongs.

All your valuations shall be according to the shekel of the sanctuary: twenty gerahs to the shekel.