2 Kings 20:9-11

9Isaiah said, “This will be the sign to you from the Lord, that He will do the thing that He has spoken: shall the shadow [indicating the time of day] go forward ten steps, or go backward ten steps?”

10Hezekiah answered, “It is easy for the shadow to go forward ten steps; no, but let the shadow turn backward ten steps.”

11So Isaiah the prophet called out to the Lord, and He brought the shadow on the steps ten steps backward by which it had gone down on the sundial of Ahaz.