(1.) God had marked their sin. He could tell the prophet (and he speaks of it with compassion) what sort of people they were that he had to deal with. I know thy works, and where thou dwellest, Rev. ii. 13. So here (v. 6): "Thy habitation is in the midst of deceit, all about thee are addicted to it; therefore stand upon thy guard." If all men are liars, it concerns us to beware of men,. and to be wise as serpents. They are deceitful men; therefore there is little hope of thy doing any good among them; for, make things ever so plain, they have some trick or other wherewith to shuffle off their convictions. This charge is enlarged upon, v. 8. Their tongue was a bow bent (v. 3), plotting and preparing mischief; here it is an arrow shot out, putting in execution what they had projected. It is as a slaying arrow (so some readings of the original have it); their tongue has been to many an instrument of death. They speak peaceably to their neighbours, against whom they are at the same time lying in wait; as Joab kissed Abner when he was about to kill him, and Cain, that he might not be suspected of any ill design, talked with his brother, freely and familiarly. Note, Fair words, when they are not attended with good intentions, are despicable, but, when they are intended as a cloak and cover for wicked intentions they are abominable. While they did all this injury to one another they put a great contempt upon God: "Not only they know not me, but (v. 6) through deceit, through the delusions of the false prophets, they refuse to know me; they are so cheated into a good opinion of their own ways, the ways of their own heart, that they desire not the knowledge of my ways." Or, "They are so wedded to this sinful course which they are in, and so bewitched with that, and its gains, that they will by no means admit the knowledge of God, because that would be a check upon them in their sins." This is the ruin of sinners: they might be taught the good knowledge of the Lord and they will not learn it; and where no knowledge of God is, what good can be expected? Hos. iv. 1.