'Angel of God' in the Bible

And the angel of God said to him, Take the flesh and the unleavened cakes, and lay them upon this rock, and pour out the broth. And he did so.

Then the woman came and told her husband, saying, A man of God came to me, and his countenance was like the countenance of an angel of God, very terrible: but I asked him not whence he was, neither did he tell me his name:

And God hearkened to the voice of Manoah; and the angel of God came again to the woman as she sat in the field: but Manoah her husband was not with her.