Matthew Poole and continuators on Proverbs 17:4

4 A wicked doer giveth heed to false lips : and a liar giveth ear to a naughty tongue .

Or, a malicious or mischievous Man, whose practice and delight it is to bring trouble to others.

Heb. to Lips of Iniquity, to any wicked counsels or speeches, to false Accusations and Calumnies, which give him occasion and encouragement to do mischief.

He who accustometh himself to false and wicked speaking delighteth in the like speeches of other men. This Proverb contains a comparison between an evil-doer, and an evil speaker, and sheweth their agreement in the same sinful practice of being greedy to hear false and wicked speeches.

Marginal references: Heb. lips of Iniquity.