2 Kings (Author Compiled by Isaiah and Jeremiah from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
Chapter 19
20Then Isaiah the son of Amoz sent to Hezekiah, saying, Thus saith the LORD God of Israel, That which thou hast prayed to me against Sennacherib king of Assyria I have heard.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.