Third Book of Kings (Author Compiled by Isaias and Jeremias from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
12:21venit autem Roboam Hierusalem et congregavit universam domum Iuda et tribum Beniamin centum octoginta milia electorum virorum et bellatorum ut pugnaret contra domum Israhel et reduceret regnum Roboam filio Salomonis
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.