2 Kings 20:8-10

American Standard Version

⁸ And Hezekiah said unto Isaiah, What shall be the sign that Jehovah will heal me, and that I shall go up unto the house of Jehovah the third day? ⁹ And Isaiah said, This shall be the sign unto thee from Jehovah, that Jehovah will do the thing that he hath spoken: ^[a]shall the shadow go forward ten ^[b]steps, or go back ten steps? ¹⁰ And Hezekiah answered, It is a light thing for the shadow to decline ten steps: nay, but let the shadow return backward ten steps.