If you go by scripture ; There are two names ; Moses and Elijah . Representing The Law and The Prophets .
Zechariah 4:14
Revelation 11:4
Considering those two verses ;
who is the Lord of All the Earth ? He is Jesus Christ. That is who returns, in Revelation 11:15
at the Last Trump ( The Last Trump is the 7th ) .
Who appeared with Jesus Christ on the mount of Transfiguration ? Matthew 17:3
We know God used Moses to bring the plagues upon Egypt, in freeing Israel from the captivity to Egypt .
God freed Israel .
Here is a verse where Moses was used, the first plague that turned The Nile river to blood
Exodus 7:20
Elijah called Fire from God, down to consume people, in 2 Kings 1
God also used Elijah, to stop the rain, for many years according to Gods word, 1 Kings 17:1
And allow rain when that ended 1 Kings 18:41
God tells us Elijah will be sent, before The Lords Day. Before the Lords Day.
Malachi 4:4-6 .
What then are the miracles attributed to the two Witnesses ?
You can read that in Revelation 11.
Given the time element : The Two witnesses appear during Satan's Tribulation. The days given, indicate
through study, that the two witnesses appear a short time before Satan and his angels get here.
3 and half days before the end of The Tribulation ( 5 months according to Revelation )
The two witnesses are killed before The Real Christ returns at The Seventh Trump ( The Last ) .
About the given to man to die once and Moses.The Bible says Moses died. But given what the Bible
says of Moses, it leaves open the question, that something different actually happened.
Keep in mind, when Christ transfigured Moses appeared along with Him.
Its likely what happened in full.
Consider what Satan was questioning Michael about reported by Jude.
Given that evidence from the Bible : The two witnessed are likely Moses and Elijah .
There is probably a lot more that the bible teaches, but I'm still reading the Bible....