2 Kings (Author Compiled by Isaiah and Jeremiah from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
20:8And 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?'
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.