Isaiah 38:5-8

5Go and say to Hezekiah, Thus saith Jehovah, the 1God 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 out of the hand of the king of Assyria, and I will defend this city.

7And this [shall be] the sign to thee from Jehovah, that Jehovah will do this thing that he hath spoken:

8behold, I will bring again the shadow of the degrees which hath gone down with the sun on the dial of Ahaz, ten degrees backward. So the sun returned on the dial ten degrees, by which it had gone down.