Numbers 5:7 in the World English Bible
then he shall confess his sin which he has done; and he shall make restitution for his guilt in full, add to it the fifth part of it, and give it to him in respect of whom he has been guilty.
Context
6 Speak unto the children of Israel, When a man or woman shall commit any sin that men commit, to do a trespass against the LORD, and that person be guilty;
7 Then they shall confess their sin which they have done: and he shall recompense his trespass with the principal thereof, and add unto it the fifth part thereof, and give it unto him against whom he hath trespassed.
8 But if the man have no kinsman to recompense the trespass unto, let the trespass be recompensed unto the LORD, even to the priest; beside the ram of the atonement, whereby an atonement shall be made for him.