And Hezekiah answered, "It is an easy thing for the shadow to go down ten degrees; no, but let the shadow go backward ten degrees."
2 Kings 20:10
Surrounding context
20:9 Then Isaiah said, "This is the sign to you from the LORD, that the LORD will do the thing which He has spoken: shall the shadow go forward ten degrees or go backward ten degrees?"
20:10 And Hezekiah answered, "It is an easy thing for the shadow to go down ten degrees; no, but let the shadow go backward ten degrees."
20:11 So Isaiah the prophet cried out to the LORD, and He brought the shadow ten degrees backward, by which it had gone down on the sundial of Ahaz.