First Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
Chapter 12
33porro de Zabulon qui egrediebantur ad proelium et stabant in acie instructi armis bellicis quinquaginta milia venerunt in auxilium non in corde duplici
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.