1 Chronicles (Author Compiled by Isaiah and Ezra from records of Nathan, Gad, Iddo, Ahijah, Jehu and others.)
Chapter 12
37And from the other side of the Jordan, of the Reubenites, and the Gadites, and of the half tribe of Manasseh, with all manner of weapons of war for battle, a hundred and twenty thousand.
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.