Proverbs 19:9 (BSB)

A false witness will not go unpunished, and one who pours out lies will perish.

From Proverbs 19. Also in the ESV.

Commentary on Proverbs 19:9

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Proverbs 19:9: Here is, 1. A repetition of what was said before (Pro 19:5), for we have need to be again and again warned of the danger of the sin of lying and false-witness-bearing, since nothing is of more fatal consequence. 2. An addition to it in one word; there it was said, He that speaks lies shall not escape, and intimated that he shall be punished.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Proverbs 19:9: A false witness shall not be unpunished,.... See Gill on Pro 19:5; and he that speaketh 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, Th2 2:11.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Proverbs 19:9: Pro 19:9 The group of proverbs (Pro 19:9-16) now following begins and closes in the same way as the preceding. 9 A lying witness doth not remain unpunished, And one who breathes out lies perisheth, or goeth to ruin, for אבד (R. בד, to divide, separate) signifies to lose oneself in the place of the separated, the dead (Arab. in the infinite).