Albert Barnes Commentary Proverbs 14:9

"A trespass-offering mocketh fools; But among the upright there is good will." — Proverbs 14:9 (ASV)

Fools make a mock - The verb in the Hebrew is singular, the noun plural. The King James Version assumes that the number is altered to individualize the application of the maxim. Others translate it: “Sin mocks the fools who are its victims,” that is, disappoints and ruins them; or, “A sin-offering only mocks the worshippers when they are willfully wicked:” they expect to gain God’s favor, and do not gain it. Understood this way, it becomes parallel to (Proverbs 15:8); (Proverbs 21:7).