And on every lofty mountain and every high hill there will be brooks running with water, in the day of the great slaughter, when the towers fall.
25. And it shall come to pass. When the prophets describe the kingdom of Christ, they commonly draw metaphors from the ordinary life of men; for the true happiness of the children of God cannot be described in any other way than by holding out an image of those things which fall under our bodily senses, and from which men form their ideas of a happy and prosperous condition.
The closing words of the foregoing paragraph (You shall be left as a beacon upon a mountain) some understand as a promise that a remnant of them should be reserved as monuments of mercy; and here the prophet tells them what good times should succeed these calamities.
Commenting on Isaiah 30:18-26
And there shall be upon every high mountain, and upon every high hill,.... Which were round about Jerusalem, and in other parts of Judea: rivers and streams of water; such abundance of rain, that it should flow in streams like rivers, from the higher to the lower lands, and water them.