And when he looked on him, he was afraid,.... What with the brightness of his clothing, Ac 10:30 and the lustre of his countenance, and the majestic form in which he appeared, he perceived there was something uncommon and divine in this vision, and therefore was filled with awe and reverence, yea, with something of a panic fear; as it was usual, even with good persons, as the patriarchs and prophets of the Old Testament, Zacharias, the Virgin Mary, and others; from a sense of the greatness of the divine majesty, which they supposed to be near, or this to be an emblem of it, and from a notion that, at the sight of God, they should die.
And said, what is it, Lord what is the matter? what is to be said or done? What is the reason of this unusual appearance? Some of the Latin copies, and the Ethiopic version, read, "who art thou, Lord?"