According to the LORD, (Deuteronomy 34:5), Moses died in Moab, but no one “to this day” knows where his grave is. An odd little passage in Jude (1:9) says that the archangel Michael fought with Satan over Moses’ body. Jeremiah (2 Kings 2-12) wrote that Elijah didn’t die but was taken up to heaven in a whirlwind by a chariot and horses of fire. Jesus was also taken up to heaven before His apostles’ very eyes (Acts 1:9). So the earth does not hold the bodies of Jesus, Moses, and Elijah.
Interestingly, the three persons who appeared in the transfiguration were Jesus, Moses, and Elijah (Matthew 17:1-11). Jesus’ face shone like the sun and His clothes were as white as light.
Peter’s awkward and terrified response to the transfiguration was to suggest they erect tabernacles to all three, yet the Father corrected him, telling him to listen to His beloved Son only.
Jesus soon let His apostles know that Elijah would come again to restore all things. Moses and Elijah are likely the two witnesses in Revelation 11 who will appear on the earth and will prophesy for 1,260 days. After prophesying, they will be conquered and killed by the beast that rises from the bottomless pit and then given life and carried into heaven by God.
As Christians, we believe that Jesus will come again in glory to judge the living and the dead and His Kingdom will have no end.
Christian Apologist 
That has been my interpretation of the identity of the two witnesses as well.
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