First Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
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.