'Angel of the Lord' in the Bible

But when he had considered this, behold, an angel of the Lord appeared to him in a dream, saying, “Joseph, son of David, do not be afraid to take Mary as your wife; for the Child who has been conceived in her is of the Holy Spirit.

And Joseph awoke from his sleep and did as the angel of the Lord commanded him, and took Mary as his wife,

Now when they had gone, behold, an angel of the Lord *appeared to Joseph in a dream and said, “Get up! Take the Child and His mother and flee to Egypt, and remain there until I tell you; for Herod is going to search for the Child to destroy Him.”

But when Herod died, behold, an angel of the Lord *appeared in a dream to Joseph in Egypt, and said,

And behold, a severe earthquake had occurred, for an angel of the Lord descended from heaven and came and rolled away the stone and sat upon it.