Isaiah 38:5-7

“Go and say to Hezekiah, ‘For the LORD, the God of David your father says this, “I have heard your prayer, I have seen your tears; listen carefully, I will add fifteen years to your life. I will rescue you and this city from the hand of the king of Assyria; and I will defend this city [Jerusalem].” ’ “This shall be the sign to you from the LORD, that the LORD will do this thing that He has spoken