2 Kings 20:8-11

8Hezekiah had said to Isaiah, “What is the confirming sign that the Lord will heal me and that I will go up to the Lord’s temple the day after tomorrow?”

9Isaiah replied, “This is your sign from the Lord confirming that the Lord will do what he has said. Do you want the shadow to move ahead ten steps or to go back ten steps?”

10Hezekiah answered, “It is easy for the shadow to lengthen ten steps, but not for it to go back ten steps.”

11Isaiah the prophet called out to the Lord, and the Lord made the shadow go back ten steps on the stairs of Ahaz.