A false witness will not go unpunished, and one who utters lies will not escape.
Here we have, 1. The sins threatened - bearing false witness in judgment and speaking lies in common conversation. Men could not arrive at such a pitch of impiety as to bear false witness (where to the guilt of a lie is added that of perjury and injury) if they had not advanced to it by allowing themselves to speak untruths in jest and banter...
A false witness shall not be unpunished,.... He that bears false witness against his neighbour in an open court of judicature; though be may not be detected by men, and so escape the punishment due to such offenders by the laws of God and men; yet God, who knows all hearts and actions, will not suffer him to go with impunity; if not punished in...
Compare Pro 19:9, where perish explains not escape here (compare Psa 88:9-10).