Leviticus 27:13
13 But if he wishes to redeem it, he shall dadd a fifth to the valuation.
Leviticus 27:15
15 And if the donor wishes to redeem his house, he shall add a fifth to the valuation price, and it shall be his.
Leviticus 27:19
19 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.