Fourth Book of Kings (Author Compiled by Isaias and Jeremias from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
18:26dixerunt autem Eliachim filius Helciae et Sobna et Ioahe Rabsaci precamur ut loquaris nobis servis tuis syriace siquidem intellegimus hanc linguam et non loquaris nobis iudaice audiente populo qui est super murum
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.