II. The alarm sounded to the nations about, by which they are summoned to take notice of what God is about to do, v. 3. The Ethiopians and Assyrians have their counsels and designs, which they have laid deep, and promise themselves much from, and, in prosecution of them, send their ambassadors and messengers from place to place; but let us now enquire what the great God says to all this. 1. He lifts up an ensign upon the mountains, and blows a trumpet, by which he proclaims war against the enemies of his church, and calls in all her friends and well-wishers into her service, v. 3. He gives notice that he is about to do some great work, as Lord of hosts. 2. All the world is bidden to take notice of it; all the dwellers on earth must see the ensign and hear the trumpet, must observe the motions of the divine providence and attend the directions of the divine will. Let all enlist under God's banner, and be on his side, and hearken to the trumpet of his word, which gives not an uncertain sound.