Joseph Benson's Commentary of the Old and New Testaments - Psalms 12:2
Psalms 12:2. They speak vanity Or, falsehood, which is a vain thing, and wants the solidity of truth. With a double heart do they speak See the margin. They speak as if they had two hearts, the one inclining them to hate their neighbour, and form designs against him, and the other to prompt the tongue to pretend a friendship for him. “When men cease to be faithful to their God, he who expects to find them so to each other will be much disappointed. The primitive sincerity will accompany... read more
Albert Barnes' Notes on the Whole Bible - Psalms 12:4
Who have said - Who habitually say. This does not mean that they had formally and openly said this - for none would be likely to do so - but that they had practically and really said this by their conduct. They acted as if it were the real principle on which they framed their lives, that they might use their tongues as they pleased.With our tongue - literally, “as to,” or “in respect to our tongue;” that is, by our tongue. It was by the tongue that they expected to accomplish their purposes. It... read more