Proverbs 26:23
"Burning lips and a wicked heart are like a potsherd covered with silver dross."
Cross References (ranked by relevance)
And the Lord said unto him, Now do ye Pharisees make clean the outside of the cup and the platter; but your inward part is full of ravening and wickedness.
He that hideth hatred with lying lips, and he that uttereth a slander, is a fool.
And they come unto thee as the people cometh, and they sit before thee as my people, and they hear thy words, but they will not do them: for with their mouth they shew much love, but their heart goeth after their covetousness.
Take away the dross from the silver, and there shall come forth a vessel for the finer.
Woe unto you, scribes and Pharisees, hypocrites! for ye are like unto whited sepulchres, which indeed appear beautiful outward, but are within full of dead men’s bones, and of all uncleanness.