Yea, while I was speaking in prayer, even the man Gabriel, whom I had seen in the vision at the beginning, being caused to fly swiftly, reached me about the time of the evening offering.
All Commentaries on Daniel 9:21 Go To Daniel 9
Jerome
AD 420
He calls the previous vision preceding this one the beginning. The effect of his prayer was considerable, and the promise of God was fulfilled which says, "While thou art yet speaking, lo, I am at hand" (Isa. 58:9). And Gabriel appears not as an angel or archangel, but as a man (vir), a term used to indicate the quality of virtue rather than specifying his sex.