Second Book of Paralipomenon (Author Compiled by Isaias and Esdras from records of Nathan, Gad, Addo, Ahias, Jehu and others.)
Chapter 20
26And on the fourth day they were assembled in the valley of Blessing: for there they blessed the Lord, and therefore they called that place the valley of Blessing until this day.
Original from Project Gutenberg - Massive cleanup of OCR problems and editing done locally.