מְכַסֶּ֣ה שִׂ֭נְאָה שִׂפְתֵי־שָׁ֑קֶר וּמוֹצִ֥א דִ֝בָּ֗ה ה֣וּא כְסִֽיל׃
心懷怨恨而加以掩飾的，嘴裡說的是謊言；散布讒言的，是愚昧人。
Rashi
He who covers up hatred has false lips The flatterer has false lips, and he hides hatred in his heart.
Rashi
and he who spreads slander is a fool Heb. דבה, a rumor about his friend, about which people will converse (דובבין).