All you people of the world and dwellers of the earth, when a banner is raised on the mountains, you will see it; when a ram’s horn sounds, you will hear it.
3. All ye inhabitants of the world. He shews that this work of God will be so manifestly excellent as to draw the attention not only of the Jews but of all nations. When he shall lift up an ensign on the mountains, you will see it.
Interpreters are very much at a loss where to find this land that lies beyond the rivers of Cush. Some take it to be Egypt, a maritime country, and full of rivers, and which courted Israel to depend upon them, but proved broken reeds; but against this it is strongly objected that the next chapter is distinguished from this by the title of the burden of Egypt.
Commenting on Isaiah 18:1-7
All ye inhabitants of the world, and dwellers on the earth,.... All the men of the world are here called upon, either by the Lord, or rather by the prophet, to be eye and ear witnesses of the judgment that should be inflicted upon the above nation, and of the salvation of his own people; which should be so manifest, that all should see it...