Isaiah 31:7

"For in that day they shall cast away every man his idols of silver, and his idols of gold, which their own hands have made unto you for a sin. And the Assyrian shall fall by the sword, not of man; and the sword, not of men, shall devour him; and he shall flee from the sword, and his young men shall become subject to taskwork."

"In that day ..." (Isaiah 31:7). This normally refers to the "last days," or to the times of Messiah's kingdom, or to the eschatalogical affairs of the "end time"; but the typical nature of the deliverance about to come to Jerusalem also justifies the understanding of the words here as "a reference to the times of the invasion of Sennacherib."[14]

The promise that Assyria would not fall by the sword of "man," nor the sword of "men," was most remarkably fulfilled in two instances, not only the destruction of Sennacherib's army by the instant death of 185,000 men on a single night, but also by the overthrow of Assyria itself on the very night when they were celebrating their victory, by means of a sudden and untimely flood of the rivers that destroyed the defenses of the city. The destruction in both instances was by, "The direct interposition of God."[15] See the prophecy of Nahum and my comments in Vol. 3 of our series on the minor prophets.