1. How he aggravates their sin, and shows the malignity that there was in it, v. 4. (1.) The wickedness was universal. They were a sinful nation; the generality of the people were vicious and profane. They were so in their national capacity. In the management of their public treaties abroad, and in the administration of public justice at home, they were corrupt. Note, It is ill with a people when sin becomes national. (2.) It was very great and heinous in its nature. They were laden with iniquity; the guilt of it, and the curse incurred by that guilt, lay very heavily upon them. It was a heavy charge that was exhibited against them, and one which they could never clear themselves from; their wickedness was upon them as a talent of lead, Zec. v. 7, 8. Their sin, as it did easily beset them and they were prone to it, was a weight upon them, Heb. xii. 1. (3.) They came of a bad stock, were a seed of evil-doers. Treachery ran in their blood; they had it by kind, which made the matter so much the worse, more provoking and less curable. They rose up in their fathers' stead, and trod in their fathers' steps, to fill up the measure of their iniquity, Num. xxxii. 14. They were a race and family of rebels. (4.) Those that were themselves debauched did what they could to debauch others. They were not only corrupt children, born tainted, but children that were corrupters, that propagated vice, and infected others with it—not only sinners, but tempters—not only actuated by Satan, but agents for him. If those that are called children, God's children, that are looked upon as belonging to his family, be wicked and vile, their example is of the most malignant influence. (5.) Their sin was a treacherous departure from God. They were deserters from their allegiance: "They have forsaken the Lord, to whom they had joined themselves; they have gone away backward, are alienated or separated from God, have turned their back upon him, deserted their colours, and quitted their service." When they were urged forward, they ran backward, as a bullock unaccustomed to the yoke, as a backsliding heifer, Hos. iv. 16. (6.) It was an impudent and daring defiance of him: They have provoked the Holy One of Israel unto anger wilfully and designedly; they knew what would anger him, and that they did. Note, The backslidings of those that have professed religion and relation to God are in a special manner provoking to him.