They have committed a trespass - They have prevaricated; they are the worst of sinners, and shall have the heaviest of punishments. Can men suppose that it is possible to hide even their dark hearts from God?

And I will make the land desolate,.... The land of Judea uncultivated, men and beast being cut off; see Ezekiel 14:15;
because they have committed a trespass, saith the Lord God; acted a treacherous and perfidious part; apostatized from God, having committed idolatry, which was the cause of their ruin; and therefore it was not without a cause that the Lord did what he did, in it; see Ezekiel 14:23.

trespass--rather, "they have perversely fallen into perverse rebellion." The Jews were not merely sinners as the other nations, but revolters and apostates. It is one thing to neglect what we know not, but quite another thing to despise what we profess to worship [JEROME], as the Jews did towards God and the law.
(1) Taken up by God's gratuitous favor from infancy (Ezekiel 16:1-7); (2) and, when grown up, joined to Him in spiritual marriage (Ezekiel 16:8-14); (3) her unfaithfulness, her sin (Ezekiel. 16:15-34); (4) the judgment (Ezekiel. 16:35-52); (5) her unlooked-for restoration (Ezekiel 16:53 to the close).

Because - They have been so perpetually trespassing, that it seems a continued act.