GAD, a Jewish prophet, the seer or domestic prophet of King David, and his adviser in all matters of importance. When the displeasure of the Almighty was roused against David and the children of Israel for numbering the people, Gad received a commission to wait upon the king, and make him an offer of three evils as a punishment for his offence. These were famine, war, or pestilence, the last of which was chosen by David, the ravages of which were terrible beyond description, and produced genuine repentance in the hearts of survivors. To perpetuate the memory of this event, Gad ordered an altar to be erected in the threshing floor of Ornan the Jebusite, around which place, it is said, the temple was afterwards built. We learn from the Old Testament that Gad was an author, who wrote a history of his own times, of which much use appears to have been made by the compilers of the books of Samuel and Chronicles. Gad was also the name of one of the twelve patriarchs, or sons of Jacob.