And the angel answering said to him, I am Gabriel, that stand in the presence of God; and am sent to speak to you…
We have heard of this angel before, and we lose something unless we look back to the circumstances with which he was previously connected. This, then, was the same angel who appeared to Daniel, to explain to him the time that was to elapse until the coming of the Messiah (Daniel 9:21-27). This being the case, we see at once the special fitness that the same angel should be employed to announce the near accomplishment of that which he had so long predicted. It is the same angel, moreover, who was sent a few months later to announce the birth of the Messiah Himself, as now of His harbinger. The same considerations apply to both transactions.
Parallel VersesKJV: And the angel answering said unto him, I am Gabriel, that stand in the presence of God; and am sent to speak unto thee, and to shew thee these glad tidings.