Leviticus 27:18-20

Complete Jewish Bible

¹⁸ But if he consecrates his field after the yovel, then the cohen is to calculate the price according to the years remaining till the next yovel, with a corresponding reduction from your valuation. ¹⁹ If the one consecrating the field wishes to redeem it, he must add one-fifth to your valuation, and the field will be set aside to revert to him. ²⁰ If the seller does not wish to redeem the field, or if [the treasurer for the cohanim] has already sold the field to someone else, it can no longer be redeemed.