Números 5:7

7 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.

7 then he shall confess his sin which he hath done: and he shall make restitution for his guilt in full, and add unto it the fifth part thereof, and give it unto him in respect of whom he hath been guilty.