1. The rebellion of the people to whom this ambassador is sent; he is sent to reduce them to their allegiance, to bring back the children of Israel to the Lord their God. Let the prophet know that there is occasion for his going on this errand, for they are a rebellious nation (v. 3), a rebellious house, v. 5. They are called children of Israel; they retain the name of their pious ancestors, but they have wretchedly degenerated, they have become Goim—nations, the word commonly used for the Gentiles. The children of Israel have become as the children of the Ethiopian (Amos ix. 7), for they are rebellious; and rebels at home are much more provoking to a prince than enemies abroad. Their idolatries and false worships were the sins which, more than any thing, denominated them a rebellious nation; for thereby they set up another prince in opposition to their rightful Sovereign, and did homage and paid tribute to the usurper, which is the highest degree of rebellion that can be. (1.) They had been all along a rebellious generation and had persisted in their rebellion: They and their fathers have transgressed against me. Note, Those are not always in the right that have antiquity and the fathers on their side; for there are errors and corruptions of long standing: and it is so far from being an excuse for walking in a bad way that our fathers walked in it that it is really an aggravation, for it is justifying the sin of those that have gone before us. They have continued in their rebellion even unto this very day; notwithstanding the various means and methods that have been made use of to reclaim them, to this day, when they are under divine rebukes for their rebellion, they continue rebellious; many among them, like Ahaz, even in their distress, trespass yet more; they are not the better for all the changes that have befallen them, but still remain unchanged. (2.) They were now hardened in their rebellion. They are impudent children, brazen-faced, and cannot blush; they are still-hearted, self-willed, and cannot bend, cannot stoop, neither ashamed nor afraid to sin; they will not be wrought upon by the sense either of honour or duty. We are willing to hope this was not the character of all, but of many, and those perhaps the leading men. Observe, [1.] God knew this concerning them, how inflexible, how incorrigible, they were. Note, God is perfectly acquainted with every man's true character, whatever his pretensions and professions may be. [2.] He told the prophet this, that he might know the better how to deal with them and what handle to take them by. He must rebuke such men as those sharply, cuttingly, must deal plainly with them, though they call it dealing roughly. God tells him this, that it might be no surprise or stumbling-block to him if he found that his preaching should not make that impression upon them, which he had reason to think it would.