Isaiah 38:7-8
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?”