Isaiah 18

1 Ah, the land of the rustling of wings, which is beyond the rivers of Ethiopia; 2 that sends ambassadors by the sea, even in vessels of papyrus on the waters, saying, “Go, you swift messengers, to a nation tall and smooth, to a people awesome from their beginning onward, a nation that measures out and treads down, whose land the rivers divide!” 3 All you inhabitants of the world, and you dwellers on the earth, when a banner is lifted up on the mountains, look! When the trumpet is blown, listen! 4 For the LORD said to me, “I will be still, and I will see in my dwelling place, like clear heat in sunshine, like a cloud of dew in the heat of harvest.” 5 For before the harvest, when the blossom is over, and the flower becomes a ripening grape, he will cut off the sprigs with pruning hooks, and he will cut down and take away the spreading branches. 6 They will be left together for the ravenous birds of the mountains, and for the animals of the earth. The ravenous birds will summer on them, and all the animals of the earth will winter on them. 7 In that time, a present will be brought to the LORD of Armies from a people tall and smooth, even from a people awesome from their beginning onward, a nation that measures out and treads down, whose land the rivers divide, to the place of the name of the LORD of Armies, Mount Zion.

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Questions about today’s reading? See if Matthew Henry can help.
Matthew Henry’s Concise Commentary, 1706

Verses 1–7
This chapter is one of the most obscure in Scripture, though more of it probably was understood by those for whose use it was first intended, than by us now. Swift messengers are sent by water to a nation marked by Providence, and measured out, trodden under foot. God’s people are trampled on; but whoever thinks to swallow them up, finds they are cast down, yet not deserted, not destroyed. All the dwellers on earth must watch the motions of the Divine Providence, and wait upon the directions of the Divine will. God gives assurance to his prophet, and by him to be given to his people. Zion is his rest for ever, and he will look after it. He will suit to their case the comforts and refreshments he provides for them; they will be acceptable, because seasonable. He will reckon with his and their enemies; and as God’s people are protected at all seasons of the year, so their enemies are exposed at all seasons. A tribute of praise should be brought to God from all this. What is offered to God, must be offered in the way he has appointed; and we may expect him to meet us where he records his name. Thus shall the nations of the earth be convinced that Jehovah is the God, and Israel is his people, and shall unite in presenting spiritual sacrifices to his glory. Happy are those who take warning by his judgment on others, and hasten to join him and his people. Whatever land or people may be intended, we are here taught not to think that God takes no care of his church, and has no respect to the affairs of men, because he permits the wicked to triumph for a season. He has wise reasons for so doing, which we cannot now understand, but which will appear at the great day of his coming, when he will bring every work into judgment, and reward every man according to his works.