III. The song of joy and praise which should be sung hereupon to the glory of God (v. 10): Sing unto the Lord a new song, a New-Testament song. The giving of Christ for a light to the Gentiles (v. 6) was a new thing, and very surprising. The apostle speaks of it as a mystery which, in other ages, was not made known, as it is now revealed, that the Gentiles should be fellow-heirs, Eph. iii. 5, 6. Now, this being the new thing which God declares, the newness of the song which is to be sung on this occasion is this, that whereas, before, the songs of the Lord were very much confined to the temple at Jerusalem (David's psalms were in the language of the Jews only, and sung by them in their own country only; for, when they were in a strange land, they hung their harps on the willow-trees and could not sing the Lord's song, as we find, Ps. cxxxvii. 2-4), now the songs of holy joy and praise shall be sung all the world over. The Gentile nations shall share equally with the Jews in New-Testament blessings, and therefore shall join in New-Testament praises and acts of worship. There shall be churches set up in Gentile nations and they shall sing a new song. The conversion of the Gentiles is often foretold under this notion, as appears, Rom. xv. 9-11. It is here promised that the praises of God's grace shall be sung with joy and thankfulness, 1. By those that live in the end of the earth, in countries that lie most remote from Jerusalem. From the uttermost parts of the earth have we heard songs, ch. xxiv. 16. This was fulfilled when Christianity was planted in our land. 2. By mariners and merchants, and those that go down to the sea, that do business in great waters, and suck the riches of the sea, and so make themselves masters of the fulness thereof and all that is therein, with which they shall praise God, and justly, for it is his, Ps. xxiv. 1; xcv. 5. The Jews traded little at sea; if therefore God's praises be sung by those that go down to the sea, it must be by Gentiles. Sea-faring men are called upon to praise God, Ps. cvii. 23. 3. By the islands and the inhabitants thereof, v. 10, and again, v. 12. Let them declare his praise in the islands, the isles of the Gentiles, probably referring to the islands of Greece. 4. By the wilderness and the cities thereof, and the villages of Kedar. These lay east from Jerusalem, as the islands lay west, so that the gospel songs should be sung from the rising of the sun to the going down of the same. The whole Gentile world had been like an island, cut off from communication with God's church, and like a wilderness, uncultivated and bringing forth no fruit to God; but now the islands and the wilderness shall praise God. 5. By the inhabitants of the rock, and those that dwell on the tops of the mountains, not only the Gentiles, but the poorest and meanest and most despicable, those that dwell in cottages, as well as those that inhabit cities and villages. The rude and most barbarous, as the mountaineers commonly are, shall be civilized by the gospel. Or by the inhabitants of the rock may be meant the inhabitants of that part of Arabia which is called Petræa—the rocky. Perhaps the neighbouring countries shared in the joy of the Israelites when they returned out of Babylon and some of them came and joined with them in their praises; but we find not that it was to any such degree as might fully answer this illustrious prophecy, and must conclude that it reaches further, and was fulfilled in that which many other prophecies of the joy of the nations are said in the New-Testament to be fulfilled in, the conversion of the Gentiles to the faith of Christ. When they are brought into the church they are brought to give glory to the Lord; then they are to him for a name and a praise, and they make it their business to praise him. He is glorified in them and by them.