Second Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
20:22And when they began to sing praises, the Lord turned their ambushments upon themselves, that is to say, of the children of Ammon, and of Moab, and of mount Seir, who were come out to fight against Juda, and they were slain.
Original from Project Gutenberg - Massive cleanup of OCR problems and editing done locally.