 Normally when it's referred to as the angel of the Lord, not an angel, but the angel, it's a Christophany, it's the Lord Jesus himself. And behold, the angel of the Lord came upon him, and light shined in the prison, and smote Peter on the side, raised him up, saying, Arise up quickly. And his chains fell off from his hands. And the angel said unto him, Gird thyself, and bind on thy sandals.