Fourth Book of Kings (Author Compiled by Isaias and Jeremias from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
16:7misit autem Ahaz nuntios ad Theglathfalassar regem Assyriorum dicens servus tuus et filius tuus ego sum ascende et salvum me fac de manu regis Syriae et de manu regis Israhel qui consurrexerunt adversum me
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.