Enoch - In Genesis 5:24, we see this person as someone who actually did not die. He walked with God, and God took him. I'm not too sure what that means; it could be something similar to what happened with Elijah in 2 Kings 2:11.
Elijah - This guy was the epitome of the office of the prophet. He did incredible miracles and spoke with amazing authority. We know from 2 Kings that he did not die, as I said before.
Moses - This guy was the epitome of the law, so much so that his name is synonymous with the word "law" in the New Testament. We do have record of his death (Deut. 34:7, Josh. 1:2), which may well make him less likely as one of the two witnesses. At the same time, I don't really know why it would be a prerequisite to never have died in order to be one of the two witnesses.
John the Apostle - We don't have a record of his death. Some people theorize that he might be one of the two witnesses because of what Jesus said in John 21:21-22.
I've heard people teach that one of the possibilities is that Moses and John may be the two witnesses because Moses would be a representative of the Old Testament law, and John would be a representative of the New Covenant of grace. I can understand that line of reasoning. Others say it could be Moses and Elijah, as we would have a representative of the law and the prophets. Could the transfiguration in Matthew 17 be some kind of foreshadowing of this? I've also heard that it could be Enoch and Elijah, because these are the two guys that were taken to heaven without dying. I've even heard that these two witnesses could be just some future people not from the past.
As far as I know, this is all speculation. Actually, I'm not sure it's terribly critical to get this pinned down. It is fun to think about though.
Last weekend I went to the Creation Museum in Kentucky. There was a lot about how the creation took place in six literal days. There was a lot about Noah's worldwide flood. There was a lot about how, especially in these days, we need to take great care in NOT compromising on what the scriptures say. I watched a short video about the danger in compromising on the first few chapters of Genesis, and how that carries huge theological implications for the origin of sin and death and the need for a Savior (see Romans 5).
And there was this exhibit that jogged my memory of 2 Peter 3, especially verse 5:
"For this they willfully forget: that by the word of God the heavens were of old, and the earth standing out of water and in the water...."
(This has everything to do with my discussion on the two witnesses, I promise!)
During my time at the museum, I realized something: that as more and more people reject God and especially the creation account, the more they are fulfilling one of His prophecies about the last days. I find it ironic that as people deny God's existence and the fact that He created the universe, they are, in effect, becoming part of the fulfillment of the prophecy found in 2 Peter 3. Incredible!
And that's exactly why I think it's probable that Enoch will be one of the two witnesses. How awesome would it be if Enoch, having been a contemporary to Adam himself, would be one of the two witnesses to tell the world that creation really did go down the way it's described in the early chapters of Genesis? It would be "in your face" to a world that had been saying all along what 2 Peter 3 describes. It would be an act of grace on God's part to give the world a witness who was really there, just to try to wake them up to the truth.
So I've got another reason to believe Enoch will be one of the two witnesses: he will witness to the fact of a literal six day creation, and that all ties in to the prophecy of 2 Peter 3.
