Fourth Book of Kings (Author Compiled by Isaias and Jeremias from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
1:9misitque ad eum quinquagenarium principem et quinquaginta qui erant sub eo qui ascendit ad eum sedentique in vertice montis ait homo Dei rex praecepit ut descendas
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.