2 Kings 20:9-11

9Isaiah answered, “This is the Lord’s sign to you that the Lord will do what he has promised: Shall the shadow go forward ten steps, or shall it go back ten steps?” 10“It is a simple matter for the shadow to go forward ten steps,” said Hezekiah. “Rather, have it go back ten steps.” 11Then the prophet Isaiah called on the Lord, and the Lord made the shadow go back the ten steps it had gone down on the stairway of Ahaz.