תנ״ך אויף במדבר 18:14

When the field is then released by the jubilee it becomes sacred to Adonoy, just as a field that was consecrated, it shall belong to the kohein, [as] his possession.

However, any dedication that a man will dedicate to Adonoy from any of his belongings be it people (slave), or animal, or of the field of his ancestral land, [none of these] can be sold or redeemed. Everything that is dedicated is most holy, unto Adonoy.