The angels at the empty tomb are another instance of the appearance of angels after Christ's birth.
Matthew 28 Authorized (King James) Version (AKJV)
1 In the end of the sabbath, as it began to dawn toward the first day of the week, came Mary Magdalene and the other Mary to see the sepulchre. 2 And, behold, there was a great earthquake: for the angel of the Lord descended from heaven, and came and rolled back the stone from the door, and sat upon it. 3 His countenance was like lightning, and his raiment white as snow: 4 and for fear of him the keepers did shake, and became as dead men. 5 And the angel answered and said unto the women, Fear not ye: for I know that ye seek Jesus, which was crucified. 6 He is not here: for he is risen, as he said. Come, see the place where the Lord lay. 7 And go quickly, and tell his disciples that he is risen from the dead; and, behold, he goeth before you into Galilee; there shall ye see him: lo, I have told you.