Proverbs 16:27 Kabbalah

אִ֣ישׁ בְּ֭לִיַּעַל כֹּרֶ֣ה רָעָ֑ה וְעַל־שפתיו [שְׂ֝פָת֗וֹ] כְּאֵ֣שׁ צָרָֽבֶת׃

An ungodly man diggeth up evil, And in his lips there is as a burning fire.

Read kabbalistic (mystical) interpretation of Proverbs 16:27: and classical mystical sources.