2 Kings 20:9-11

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