'Angel of God' in the Bible

And the angel of God said unto him, "Take the flesh and the sweet cakes and put them upon this rock, and pour out the broth." And he did so.

Then the wife went and told her husband, saying, "A man of God came unto me, and the fashion of him was like the fashion of an Angel of God, exceeding fearful. But I asked him not whence he was, neither told he me his name.

And God heard the voice of Manoah, and the angel of God came again unto the wife, as she sat in the fields: But Manoah her husband was not with her.