2 Kings 20:4-6

4Before Isaiah had gone out of the middle courtyard, the word of the Lord came to him, saying,

5“Go back and tell Hezekiah the leader of My people, ‘Thus says the Lord, the God of David your father (ancestor): “I have heard your prayer, I have seen your tears. Behold, I am healing you; on the third day you shall go up to the house of the Lord.

6I will add fifteen years to your life and save you and this city [Jerusalem] from the hand of the king of Assyria; and I will protect this city for My own sake and for My servant David’s sake.” ’ ”