Proverbs 26:23-25

Amplified Bible

²³ 
Like a [common] clay vessel covered with the silver dross [making it appear silver when it has no real value]
Are burning lips [murmuring manipulative words] and a wicked heart.
²⁴ 
He who hates, disguises it with his lips,
But he stores up deceit in his heart.
²⁵ 
When he speaks graciously and kindly [to conceal his malice], do not trust him,
For seven abominations are in his heart.