Isaiah 38:5-8

5Go, and say to Hezekiah, Thus saith the LORD, the God of David thy father, I have heard thy prayer, I have seen thy tears: behold, I will add to thy days fifteen years. 6And I will deliver thee and this city from the hand of the king of Assyria: and I will defend this city. 7And this shall be a sign to thee from the LORD, that the LORD will do this thing that he hath spoken; 8Behold, I will bring again the shadow of the degrees, which hath gone down on the sun dial of Ahaz, ten degrees backward. So the sun returned ten degrees, by which degrees it had gone down.1