2 Kings 20:8-11

8And Hezekiah said to Isaiah, What shall be the sign that the LORD will heal me, and that I shall go up into the house of the LORD the third day? 9And Isaiah said, This sign shalt thou have of the LORD, that the LORD will do the thing that he hath spoken: shall the shadow go forward ten degrees, or go back ten degrees? 10And Hezekiah answered, It is a light thing for the shadow to go forward ten degrees: nay, but let the shadow return backward ten degrees. 11And Isaiah the prophet cried to the LORD: and he brought the shadow ten degrees backward, by which it had gone down on the dial of Ahaz.1