2 Kings 20:9-11

9Then Isaiah said, “This will be the sign to you from Adonai, that Adonai will do this word He has spoken: Should the shadow go forward ten steps or go back ten steps?”

10Hezekiah answered, “It’s easy for a shadow to go forward ten steps; no, let the shadow turn back ten steps.”

11Then Isaiah the prophet cried to Adonai; and He brought the shadow ten steps backward, by which it had gone down on the sundial of Ahaz.