8 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?”

References for 2 Kings 20:9

10 “It is a simple matter for the shadow to go forward ten steps,” said Hezekiah. “Rather, have it go back ten steps.”

References for 2 Kings 20:10

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.

References for 2 Kings 20:11