(3.) Here is a woe against him for building a town and a city by blood and extortion (v. 12): He builds a town, and is him-self lord of it; he establishes a city, and makes it his royal seat. So Nebuchadnezzar did (Dan. iv. 30): Is not this great Babylon that I have built for the house of the kingdom? But it is built with the blood of his own subjects, whom he has oppressed, and the blood of his neighbours, whom he has unjustly invaded; it is established by iniquity, by the unrighteous laws that are made for the security of it. Woe to him that does so; for the towns and cities thus built can never be established; they will fall, and their founders be buried in the ruins of them. Babylon, which was built by blood and iniquity, did not continue long; its day soon came to fall; and then this woe took effect, when that prophecy, which is expressed as a history (Isa. xxi. 9), proved a history indeed: Babylon has fallen, has fallen! And the destruction of that city was, [1.] The shame of the Chaldeans, who had taken so much pains, and were at such a vast expense, to fortify it (v. 13): Is it not of the Lord of hosts that the people who have laboured so hard to defend that city shall labour in the very fire, shall see the out-works which they confided in the strength of set on fire, and shall labour in vain to save them? Or they, in their pursuits of worldly wealth and honour, put themselves to great fatigue, and ran a great hazard, as those that labour in the fire do. The worst that can be said of the labourers in God's vineyards is that they have borne the burden and heat of the day (Matt. xx. 12); but those that are eager in their worldly pursuits labour in the very fire, make themselves perfect slaves to their lusts. There is not a greater drudge in the world than he that is under the power of reigning covetousness. And what comes of it? Though they take a world of pains they are but poorly paid for it; for, after all, they weary themselves for very vanity; they were told it was vanity, and when they find themselves disappointed of it, and disappointed in it, they will own it is worse than vanity, it is vexation of spirit. [2.] It was the honour of God, as a God of impartial justice and irresistible power; for by the ruin of the Chaldean monarchy (which all the world could not but take notice of) the earth was filled with the knowledge of the glory of the Lord, v. 14. The Lord is known by these judgments which he executes, especially when he is pleased to look upon proud men and abase them, for he thereby proves himself to be God alone, Job xl. 11, 12. See what good God brings out of the staining and sinking of earthly glory; he thereby manifests and magnifies his own glory, and fills the earth with the knowledge of it as plentifully as the waters cover the sea, which lie deep, spread far, and shall not be dried up until time shall be no more. Such is the knowledge of the glory of God in the face of Jesus Christ given by the gospel (2 Cor. iv. 6), and such was the knowledge of his glory by the miraculous ruin of Babylon. Note, Such as will not be taught the knowledge of God's glory by the judgments of his mouth shall be made to know and acknowledge it by the judgments of his hand.