2 Kings 20:8-11 New King James Version (NKJV)
8 And Hezekiah said to Isaiah, “What is the sign that the Lord will heal me, and that I shall go up to the house of the Lord the third day?”
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?”
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.”
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.
2 Kings 20:8-11 New Living Translation (NLT)
8 Meanwhile, Hezekiah had said to Isaiah, “What sign will the Lord give to prove that he will heal me and that I will go to the Temple of the Lord three days from now?”
9 Isaiah replied, “This is the sign from the Lord to prove that he will do as he promised. Would you like the shadow on the sundial to go forward ten steps or backward ten steps?[a]”
10 “The shadow always moves forward,” Hezekiah replied, “so that would be easy. Make it go ten steps backward instead.” 11 So Isaiah the prophet asked the Lord to do this, and he caused the shadow to move ten steps backward on the sundial[b] of Ahaz!