Commentaire sur Les Proverbes 26:23

overlaid on earthenware Like silver dross attached to the earthenware in which it is refined, making the utensil shine as though it were silver although it has no use, so are burning lips and wicked heart, which pursue people to entice them with smooth and hypocritical talk.

and a wicked heart They appear to be friends, but they are enemies.

burning Heb. דולקים, as in “you pursued (דלקת) me so hotly” (Gen. 31:36).