Deuteronomy 19:16-20

16Somebody may accuse another person because he wants to hurt him. He tells lies against him.

17Then both of them must stand in front of the judges that the Lord has chosen. Those are the priests and the judges who have authority at that time.

18The judges must be careful to discover who is telling the truth. The person may be speaking lies against another Israelite to accuse him.

19If he is telling lies, you must punish him in the same way that he wanted to punish the other Israelite. You must remove evil things like this from among yourselves.

20Then everyone else will hear what has happened. They will be afraid to do any more evil things like that.