'One fifth' in the Bible

And he shall make restitution [for] what he sinned {because of} a holy thing and shall add one-fifth of {its value} onto it and shall give it to the priest. The priest shall make atonement for him with the ram of the guilt offering, and he will be forgiven.

or {regarding} anything about which he has sworn {falsely}, then he shall repay it {according to} its value and shall add one-fifth of its value to it--he must give it {to whom it belongs} on the day of his guilt offering.