Second Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
20:21And he gave counsel to the people, and appointed the singing men of the Lord, to praise him by their companies, and to go before the army, and with one voice to say: Give glory to the Lord, for his mercy endureth for ever.
Original from Project Gutenberg - Massive cleanup of OCR problems and editing done locally.