Verse 1
"...another mighty angel..."
Both chapters 10 and 11 are parenthetical chapters which do not speak to effects of the second great woe unleashed by the sounding of the sixth trumpet. While it is not stated that the second woe is finished until we reach chapter 11:14; these two chapters serve as a premise for events which will unfold in chapters 12 and 13, concerning the two witnesses which shall come down from heaven to the earth. The second of the last three woes of chapter 8, clearly ends with the death of a third of mankind in chapter 9; and the explanation of why it happened, at conclusion of that chapter.
Who is the mighty angel, or messenger, mentioned in this chapter?
Both chapters 10 and 11 bring forth information related to this angel. At first glance, {11:3} seems to indicate that this angel or messenger, with the little book, may be Jesus himself, although John doesn't recognize him as such. This, of course, is not to suggest that Jesus is an angelic being, but that he may possibly be the "messenger" who delivers the little book to John. It is more likely however, that the one spoken of here may be the archangel Michael.
When we look at the first few verses of chapter 11, there is no real break in continuity between the angel speaking in verses 1-2, where he tells John to measure the temple; and the statement made in verse 3 concerning the giving of power to, "...my two witnesses...". However, we need to be aware, that in both chapter 10 and 11, we are not only hearing the angel speak to John; but there are several verses in which John is hearing a voice from heaven. The voice from heaven may account for words of 11:3, although in the other instances, it is specifically stated that John was hearing a voice from heaven. This is not the case with verse 3.
The two witnesses are said to be, " ...the two olive trees, and the two candelesticks standing before the God of the Earth." This makes it clear that these are the witnesses of God Himself and not of an angelic being.
At the same time, we know from Scripture that Michael, is the guardian angel of Israel {Dan. 12:1}. As such, He may be speaking here in the capacity of one who is given charge over the nation by God Himself, and uttering, as a messenger, the very words of the Almighty, rather than speaking in his own stead.
Since the two witnesses had stood in the very presence of the throne of God prior to coming to the earth {Zech. 4:14}, it would seem to necessitate that the speaker is ultimately God Himself, but He may be here speaking through the mouth of the angel.
"...his face was as it were the sun,..."
The angel (messenger) has a brilliant countenance about his face. Rev. 1:16 tells us that the countenance of Jesus, as seen by John, was "...as the sun shining in its strength." When Jesus was transfigured (Matt. 17:2) it was also stated that "...his face did shine as the sun,.."
Jewish tradition relates that wherever the archangel Michael goes, the shechinah, the radiant glory of God, is to be found.
"...a rainbow was upon his head ..."
This speaks of the covenant which God made with man after the flood of Noah's day. It serves as a reminder that He will never again destroy the earth by water. The final judgment of the last days is to be rendered by fire, not water.
"...feet as pillars of fire..."
In the studying of chapters 10 and 11 together, it becomes more evident that the two feet of the angel are representative of the two witnesses which are to come down from heaven. They are identified in both {Zech. 4:11-14} and in {Rev. 11:3-4}.
{Chapters 10:4-9 and 12:5-9}, in the Book of Daniel, also seem to point to this person and the two witnesses. The two witnesses there are set upon the two banks of the Tigris River near Babylon. The feet of the angel of Rev. 10 however, are set upon the sea and upon the earth. This indicates that they are the counterpart to, and shall stand in testimony against, the one who shall rise up out of the sea {13:1}; and him who shall rise up out of the earth {13:11}. These two, who stood before the God of heaven, are also to play an integral part in helping the righteous woman of chapter 12 flee into the wilderness, escaping the wrath of the dragon (Satan).
Fire is closely associated with them and their testimony (11:4-5). They appear as "...pillars of fire..." It makes perfect sense that these two should be Moses and Elijah; for they more than any others, are representative of the Law and the Prophets of God. This supposition is further supported by statements which will be made in chapter 11.
Here we are seeing the scenario developing whereby the Lawgiver, Moses (Exodus 19-20), shall be set in opposition to the lawless one, the Antichrist (II Thess. 2:8). Then too we see Elijah, the true prophet of God, who called down fire from heaven (I Kings 18:19-38), in like fashion, set in opposition to the False Prophet, who will also call fire down from heaven (Rev. 13:13). It's God's two witnesses against Satan's two witnesses.