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.
Have you met that person that is just too sweet. They say the nicest things. They never seem to disagree with you to your face. They will stand in the congregation, even, and say the nicest things but then you find out later that they said the opposite in private.
This verse is about people like that. They talk real sweet. But it is not the truth. It is not what they really think. Be careful of those people!