Leviticus 27:13 in the World English Bible
But if he will indeed redeem it, then he shall add the fifth part of it to its valuation.
Context
12 And the priest shall value it, whether it be good or bad: as thou valuest it, who art the priest, so shall it be.
13 But if he will at all redeem it, then he shall add a fifth part thereof unto thy estimation.
14 And when a man shall sanctify his house to be holy unto the LORD, then the priest shall estimate it, whether it be good or bad: as the priest shall estimate it, so shall it stand.