2 Kings 20:9 in the World English Bible
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?”
Context
8 And Hezekiah said unto Isaiah, What shall be the sign that the LORD will heal me, and that I shall go up into the house of the LORD the third day?
9 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?
10 And Hezekiah answered, It is a light thing for the shadow to go down ten degrees: nay, but let the shadow return backward ten degrees.