Feast Day - December 26
The Holy Prophet-King David was a forefather of our Lord Jesus Christ according to the flesh. The youngest son of Jesse, David shepherded a flock of sheep belonging to his father. He was distinguished by his deep faith, and he zealously fulfilled the will of God.
During a battle with the Philistines, he vanquished the giant Goliath in single combat, which decided the outcome of the war in favor of the Israelites. He endured many things from King Saul, who saw him as a favorite of the people and his rival. David, however, showed his own decency and magnanimity. Twice, when he had the possibility of killing Saul, he did not do so.
After Saul and his son perished, David was proclaimed king of the southern part of Israel, and after Saul's second son was killed, he became king of all Israel. He built a new capital, Jerusalem ("the City of Peace"), and a new tabernacle. His great wish to build a Temple was not realized. It was foretold to him that his son would build the Temple.
The life of the Prophet David was darkened by a grievous falling: he took Uriah's wife for himself, and sent Uriah to his death in battle. He was also an example of great repentance, humbly and with faith bearing the sorrows sent in punishment for his sins. St David gave a model for repentance in Psalm 50/51. King David died in great old age with steadfast faith in the coming of the promised Messiah, our Lord Jesus Christ. His divinely-inspired Psalter is widely used in the divine services and in personal prayers. (See the Books of Kings and Chronicles).
The holy Prophet-King David is invoked by those facing a difficult situation, such as an interview, etc.
Original Source: Orthodox Church in America - www.oca.or