John Calvin,
Calvin's Commentaries—Complete…
“ But he puts his question as if addressing a man, because it is only from the answer he learns that it is an angel. This doubt gives more credibility to the vision, while he is gradually led from the view of the man whom he addresses to the recognition of an angel. The words, at the same time, imply that it was not an ordinary angel, but one of special excellence. For he calls himself captain of the Lord’s host, a term which may be understood to comprehend not merely his chosen people, but angels also. ”
