2Kings 20:8-11 (NIV)
Hezekiah had asked Isaiah, "What will be
the sign that the LORD will heal me and that I
will go up to the temple of the LORD on the third day from now?" 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 upon the LORD, and the LORD made the
shadow go back the ten steps it had gone down on
the stairway of Ahaz.