Albert Barnes Commentary Proverbs 19:28

"A worthless witness mocketh at justice; And the mouth of the wicked swalloweth iniquity." — Proverbs 19:28 (ASV)

Ungodly witness - literally, “Witness of Belial,” “worthless,” “untruthful.”

Devours iniquity - Seizes on it eagerly, as a delicacy, lives on it.