In those days Hezekiah was mortally ill. And Isaiah the prophet, the son of Amoz, came to him and said to him, “Thus says the Lord: Set your house in order, for you shall die, and not live.”
He explained, “As long as the child was alive, I fasted and wept because I thought, ‘Who knows? The Lord may be gracious to me, so that the child may live.’
When Ahithophel realized that his advice was not followed, he saddled his donkey and returned to his house in his own city. He gave instruction to his household, then he hanged himself and died; he was interred in the tomb of his father.
He sent Eliakim, who was over the household, and Shebna the scribe, and the elders of the priests, covered with sackcloth, to Isaiah the prophet, the son of Amoz.
Then Isaiah the son of Amoz sent to Hezekiah, saying, “Thus says the Lord God of Israel: Because you have prayed to Me about Sennacherib king of Assyria,
When God saw their actions, that they turned from their evil ways, He changed His mind about the disaster that He had said He would bring upon them, and He did not do it.