Proverbs 26:23-26 RSV

23 Like the glaze covering an earthen vessel are smooth lips with an evil heart.
24 He who hates, dissembles with his lips and harbors deceit in his heart;
25 when he speaks graciously, believe him not, for there are seven abominations in his heart;
26 though his hatred be covered with guile, his wickedness will be exposed in the assembly.