3/31/13 V. 10, When the Lord comes to rescue his people we will, as Rev 5:9 and 14:3 also says, sing a new song. And that song will be the song of Moses after Israel’s deliverance from the Egyptians (Rev. 15:3). From every corner of the earth we will sing and also those who go down into the sea and all that is in it.
As noted before, in prophecy the sea represents peoples, nations, languages (Rev 17:15). Rev 10:5 uses the same phrase, “the sea and all that is in it.” However, that passage is primarily an allusion to Dan 10, so perhaps this phrase is merely an echo in Revelation or perhaps a sub-allusion of lesser prominence.
The islands, which at the beginning of chapter 41 seemed to symbolize the scattered people of God, will also shout.
V. 11, Even among those who had not always been faithful to God, living in a spiritual wilderness, Kedar (Arabian descendants of Ismael) and Sela (Petra, Edom), will have those who will turn to God and shout for joy at his coming. After all, Rev 7:9-12 says that the people come from every nation, tribe, language, and people.
V. 12, God’s people will give glory to the Lord. Giving glory, again, could just be a common phrase that was used. However, in Rev 14:7 those words are used extremely significantly, at the tipping point of Revelation. Just as Jesus is about to come and the enemies of God are manipulating and even forcing the inhabitants of the earth to worship their self-made god in their way, the three angels are calling the world to “give glory” and worship the God who made “the sea and all that is in it” in his way, which is an allusion to the Sabbath commandment. One gets the feeling that at least a little something more is going on beneath the surface here in this passage of Isaiah.
V. 13, The Lord goes forth like a warrior (Rev 6:2, 19:11) and with the sounding of the seventh trumpet he will return to the earth in power and great glory with a trumpet call and a loud command (1Th 4:16). And his enemies will stand no chance against him.