John Gill Commentary Proverbs 19:9

"A false witness shall not be unpunished; And he that uttereth lies shall perish." — Proverbs 19:9 (ASV)

A false witness shall not be unpunished (See Gill on Proverbs 19:5); and [he that] speaks lies shall perish ; or "be lost", shall be undone for ever; he shall not enter into the holy city, but have his part in the lake of fire: they that speak lies in hypocrisy, doctrinal ones, and are given up to believe and profess them, such shall be damned, (2 Thessalonians 2:11 2 Thessalonians 2:12) .