Proverbs 26:24-26, 28

He who hates, disguises it with his lips, But he stores up deceit in his heart. When he speaks graciously and kindly [to conceal his malice], do not trust him, For seven abominations are in his heart. Though his hatred covers itself with guile and deceit, His malevolence will be revealed openly before the assembly.

A lying tongue hates those it wounds and crushes, And a flattering mouth works ruin.