Who told the shepherds the Savior had been born?

The shepherds were told about the birth of the Savior by an angel of the Lord. According to the Gospel of Luke in the New Testament, the angel appeared to them while they were watching over their flocks at night, bringing them good news of great joy that a Savior, Christ the Lord, had been born in Bethlehem. This announcement was accompanied by a multitude of heavenly hosts praising God.