Deuteronomy 19:16-19 NIV

[16] If a malicious witness takes the stand to accuse someone of a crime, [17] the two people involved in the dispute must stand in the presence of the LORD before the priests and the judges who are in office at the time. [18] The judges must make a thorough investigation, and if the witness proves to be a liar, giving false testimony against a fellow Israelite, [19] then do to the false witness as that witness intended to do to the other party. You must purge the evil from among you.