2 Kings 20:9 in the King James Version
And Isaiah said, This sign shalt thou have of the LORD, that the LORD will do the thing that he hath spoken: shall the shadow go forward ten degrees, or go back ten degrees?
Context
8 Hezekiah said to Isaiah, “What will be the sign that the LORD will heal me, and that I will go up to the LORD’s house the third day?”
9 Isaiah said, “This will be the sign to you from the LORD, that the LORD will do the thing that he has spoken: should the shadow go forward ten steps, or go back ten steps?”
10 Hezekiah answered, “It is a light thing for the shadow to go forward ten steps. No, but let the shadow return backward ten steps.”