9And Isaiah had replied, “This will be a sign to you from the LORD that He will do what He has promised: Would you like the shadow to go forward ten steps, or back ten steps?”
10“It is easy for the shadow to lengthen ten steps,” answered Hezekiah, “but not for it to go back ten steps.”
11So Isaiah the prophet called out to the LORD, and He brought the shadow back the ten steps it had descended on the stairway of Ahaz.
— 2 Kings 20:9-11