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, or under pretence of doing good. Thus men teach their tongues to speak lies, Jer 9:5. Those that will take a liberty to tell lies in discourse are in a fair way to be guilty of the greater wickedness of false-witness-bearing, whenever they are tempted to it, though they seemed to detest it. Those that can swallow a false word debauch their consciences, so that a false oath will not choke them. 2. The threatening itself: They shall not go unpunished; they shall not escape. This intimates that that which emboldens them in the sin is the hope of impunity, it being a sin which commonly escapes punishment from men, though the law is strict, Deu 19:18, Deu 19:19. But it shall not escape the righteous judgment of God, who is jealous, and will not suffer his name to be profaned; we know where all liars will have their everlasting portion.

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 this world, he shall be in the world to come; for bearing false witness, or perjury, is a grievous offence to God;

and he that speaketh lies shall not escape; even he that useth himself to lying in private conversation shall not escape the reproach of men; for nothing is more scandalous than lying; nor the wrath of God, such shall have their portion in the lake which burneth with fire and brimstone, Rev 21:8.

Compare Pro 19:9, where perish explains not escape here (compare Psa 88:9-10).