Leviticus 27:18-20

New International Version - UK

¹⁸ But if they dedicate a field after the Jubilee, the priest will determine the value according to the number of years that remain until the next Year of Jubilee, and its set value will be reduced. ¹⁹ If the one who dedicates the field wishes to redeem it, they must add a fifth to its value, and the field will again become theirs. ²⁰ If, however, they do not redeem the field, or if they have sold it to someone else, it can never be redeemed.