'Man of God' in the Bible

Then the woman went to tell her husband. She said, "A man of God appeared to me. He looked like what an angel of God would look like very frightening. I didn't ask him where he had come from and he didn't tell me his name.

So Manoah prayed to the LORD, "Please, Lord, have the man of God whom you sent before come again so he can instruct us what to do on behalf of the child who is to be born."