Leviticus 27:19

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.

Read Leviticus 27:19 Using Other Translations

And if he that sanctified the field will in any wise redeem it, then he shall add the fifth part of the money of thy estimation unto it, and it shall be assured to him.
And if he who dedicates the field wishes to redeem it, then he shall add a fifth to its valuation price, and it shall remain his.
If the person who dedicated the field wants to buy it back, he must pay the value set by the priest, plus 20 percent. Then the field will again be legally his.