Isaiah 38:6-8

38:6 and rescue you and this city from the king of Assyria. I will shield this city.”’” 38:7 Isaiah replied, “This is your sign from the Lord confirming that the Lord will do what he has said: 38:8 Look, I will make the shadow go back ten steps on the stairs of Ahaz.” And then the shadow went back ten steps.

Isaiah 38:22

38:22 Hezekiah said, “What is the confirming sign that I will go up to the Lord’s temple?”