Numbers 5:7

he shall confess his sin that he has committed . And he shall make full restitution for his wrong , adding a fifth to it and giving it to him to whom he did the wrong .

and must confess the sin they have committed. They must make full restitution for the wrong they have done, add a fifth of the value to it and give it all to the person they have wronged.

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.