Second Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
20:22cumque coepissent laudes canere vertit Dominus insidias eorum in semet ipsos filiorum scilicet Ammon et Moab et montis Seir qui egressi fuerant ut pugnarent contra Iudam et percussi sunt
Original from The Bible Foundation - bf.org. They claim public domain status for their original text.