2 Kings 20:9-11 NIV

[9] Isaiah answered, “This is the LORD’s sign to you that the LORD will do what he has promised: Shall the shadow go forward ten steps, or shall it go back ten steps?” [10] “It is a simple matter for the shadow to go forward ten steps,” said Hezekiah. “Rather, have it go back ten steps.” [11] Then the prophet Isaiah called on the LORD, and the LORD made the shadow go back the ten steps it had gone down on the stairway of Ahaz.