Leviticus 27:19-21

19And if he who dedicates the field ever wishes to redeem it, then he must add one-fifth of the money of your valuation to it, and it shall belong to him.

20But if he does not want to redeem the field, or if he has sold the field to another man, it shall not be redeemed anymore;

21but the field, when it is released in the Jubilee, shall be holy to the Lord, as a devoted field; it shall be the possession of the priest.