Psalm 5:9
For there is no faithfulness in their mouth; their inward part is very wickedness; their throat is an open sepulcher; they flatter with their tongue.
Torrey's Topical Textbook—AKJV

Psalm 55:21
The words of his mouth were smoother than butter, but war was in his heart: his words were softer than oil, yet were they drawn swords.
Torrey's Topical Textbook—AKJV