'Man of God' in the Bible

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:

Then Manoah entreated the LORD, and said, O my Lord, let the man of God, whom thou didst send come again to us, and teach us what we shall do to the child that shall be born.