2 Kings 20:8-10

Young's Literal Translation

⁸ And Hezekiah saith unto Isaiah, `What [is] the sign that Jehovah doth give healing to me, that I have gone up on the third day to the house of Jehovah?'

⁹ And Isaiah saith, `This [is] to thee the sign from Jehovah, that Jehovah doth the thing that He hath spoken -- The shadow hath gone on ten degrees, or it doth turn back ten degrees?'

¹⁰ And Hezekiah saith, `It hath been light for the shadow to incline ten degrees: nay, but let the shadow turn backward ten degrees.'