'Angel of the Lord' in the Bible

But after he had considered these things, an angel of the Lord suddenly appeared to him in a dream, saying, “Joseph, son of David, don’t be afraid to take Mary as your wife, because what has been conceived in her is by the Holy Spirit.

After they were gone, an angel of the Lord suddenly appeared to Joseph in a dream, saying, “Get up! Take the child and His mother, flee to Egypt, and stay there until I tell you. For Herod is about to search for the child to destroy Him.”

After Herod died, an angel of the Lord suddenly appeared in a dream to Joseph in Egypt,

Suddenly there was a violent earthquake, because an angel of the Lord descended from heaven and approached the tomb. He rolled back the stone and was sitting on it.