“When the servants of King Hezekiah came to Isaiah, Isaiah said to them. ‘Say to your master. Thus says Yahweh. Do not be afraid because of the words that you have heard, with which the servants of the king of Assyria have reviled me. I myself will put a spirit in him, so that he shall hear a rumor and return to his own land. I will cause him to fall by the sword in his own land.’”
Here we have the first intervention of the great prophet Isaiah, whose influence, due to his writings of the book of Isaiah will have a great impact on future Israelite life. The response of Isaiah is quite remarkable. Because the servants of the king of Assyria had reviled Yahweh, he was going to retaliate against him. Yahweh said that he would spread a rumor that would make the army return to its own land where the king would be killed at home in Assyria. The fact is that King Sennacherib of Assyria did return home without capturing Jerusalem. He was then killed by his sons. It is what it is.