Isaiah 38:7-8, 22

And this is the sign to you from the LORD, that the LORD will do this thing which He has spoken: “Behold, I will bring the shadow on the sundial, which has gone down with the sun on the sundial of Ahaz, ten degrees backward.” So the sun returned ten degrees on the dial by which it had gone down.

And Hezekiah had said, “What is the sign that I shall go up to the house of the LORD?”