And there shall be upon every high mountain, and upon every high hill, rivers and streams of waters in the day of the great slaughter, when the towers fall.
There shall be upon every high mountain ... rivers - even the otherwise barren hills shall then be well watered (Isaiah 44:3).
In the day ... when the towers fall - when the disobedient among the Jews shall have been slain, as foretold in Isaiah 30:16: "towers," i:e., mighty men (Isaiah 2:15). Or else, the towers of the Assyrian Sennacherib, or of Babylon, types of all enemies of God's people.