Isaiah 38:7-8, 22

This will be a sign to you from YAHWEH as a confirmation that I will do for you what I have promised. I will cause the sun’s shadow to retreat ten steps on the stairway of Ahaz.’ ” Then the sunlight went back up the ten steps it had gone down.

And Hezekiah had said, “What will be the sign from God that I will be healed and go up again to worship in YAHWEH’s house?”