27:12 The Lord would assemble the remnant of His people from the Promised Land as a farmer gathers up (gleans, cf. 24:13) his crops. Not only will He destroy His enemies then, but He will gather redeemed Israelites into His kingdom (cf. Matt. 24:40-41; Rev. 14:15-16).
27:13 That day will prove to be the greatest Day of Atonement of all time (cf. v. 9). A trumpet blast will summon all the redeemed from distant parts of the earth, not just Jews from Palestine (cf. Zech. 9:14; Matt. 24:31). They, too, will come to Jerusalem and enter the millennial kingdom (cf. 19:24-25).262Isaiah used Assyria and Egypt here as he used Edom earlier (cf. 25:10), namely, as representative in his time of areas of the world in the future.
"These verses provide a fitting climax to chs. 24-27 with their emphasis upon God's sovereignty over the nations and his intention to restore his people from the nations. In this respect this is the second of three such passages. The others are 11:12-16 and 35:1-10. Each of these occurs at the end of a major segment. This fact suggests something about the structure of the book. . . . chs. 7-12 make the point that if you trust in the nations, the nations will destroy you. Nonetheless, God will not leave his people in destruction; he intends to deliver them from the nations. But this raises the immediate question: Canhe deliver them from the nations? Chs. 13-27 answer that question with a resounding affirmative. They do so first in a particularizing way, showing that all nations, including Israel, are under God's judgment (chs. 13-23). Then chs. 24-27 make the same point in a more generalized way, asserting that God is the main actor in the drama of human history. These things being so, God can deliver his people, and the promise is reaffirmed in these two closing verses."263