Rev 11:1; Then there was given me a measuring rod like a staff; and someone said, "Get up and measure the temple of God and the altar, and those who worship in it.
Rev 11:2; "Leave out the court which is outside the temple and do not measure it, for it has been given to the nations; and they will tread under foot the holy city for forty-two months.
Rev 11:3; "And I will grant authority to my two witnesses, and they will prophesy for twelve hundred and sixty days, clothed in sackcloth."
Rev 11:4; These are the two olive trees and the two lampstands that stand before the Lord of the earth.
Rev 11:5; And if anyone wants to harm them, fire flows out of their mouth and devours their enemies; so if anyone wants to harm them, he must be killed in this way.
Rev 11:6; These have the power to shut up the sky, so that rain will not fall during the days of their prophesying; and they have power over the waters to turn them into blood, and to strike the earth with every plague, as often as they desire.
Rev 11:7; When they have finished their testimony, the beast that comes up out of the abyss will make war with them, and overcome them and kill them.
Rev 11:8; And their dead bodies will lie in the street of the great city which mystically is called Sodom and Egypt, where also their Lord was crucified.
Rev 11:9; Those from the peoples and tribes and tongues and nations will look at their dead bodies for three and a half days, and will not permit their dead bodies to be laid in a tomb.
Rev 11:10; And those who dwell on the earth will rejoice over them and celebrate; and they will send gifts to one another, because these two prophets tormented those who dwell on the earth.
Rev 11:11; But after the three and a half days, the breath of life from God came into them, and they stood on their feet; and great fear fell upon those who were watching them.
Rev 11:12; And they heard a loud voice from heaven saying to them, "Come up here." Then they went up into heaven in the cloud, and their enemies watched them.
Rev 11:13; And in that hour there was a great earthquake, and a tenth of the city fell; seven thousand people were killed in the earthquake, and the rest were terrified and gave glory to the God of heaven.
Zech 4:2; He said to me, "What do you see?" And I said, "I see, and behold, a lampstand all of gold with its bowl on the top of it, and its seven lamps on it with seven spouts belonging to each of the lamps which are on the top of it;
Zech 4:3; also two olive trees by it, one on the right side of the bowl and the other on its left side."
Zech 4:4; Then I said to the angel who was speaking with me saying, "What are these, my lord?"
Zech 4:5; So the angel who was speaking with me answered and said to me, "Do you not know what these are?" And I said, "No, my lord."
Zech 4:11; Then I said to him, "What are these two olive trees on the right of the lampstand and on its left?"
Zech 4:12; And I answered the second time and said to him, "What are the two olive branches which are beside the two golden pipes, which empty the golden oil from themselves?"
Zech 4:13; So he answered me, saying, "Do you not know what these are?" And I said, "No, my lord."
Zech 4:14; Then he said, "These are the two anointed ones who are standing by the Lord of the whole earth."
It seems a temple will exist at this time ( presumably the 3rd temple in Jerusalem ) the courtyard of the temple will "given to the nations" ( presumably the Gentile nations ) and they
will trample it underfoot, this could correlate with the timing of the abomination of desolation, during which time the temple will be desecrated again.
Difficult passages at best. Whoever the two witnesses are, they will be clothed in sackcloth, some Bibles say "burlap bags". They will only prophecy for 3 1/2 years ( 1.260 days )
They will have the power to kill people by fire coming out of their mouths.
They will have the power to keep it from raining, they will have the power to turn water into blood. After the 3 1/2 years are over, the beast will kill them. Their bodies will lie
in the streets of Jerusalem ( where their Lord was crucified ) for 3 1/2 days. After 3 1/2 days they will come back to life and go up into heaven.
This is often correlated with Zechariah 4. Which talks about the two live trees, and the two lampstands ( Rev 11:4; )
It is difficult to know how much of this is symbolic ( if any of it ) and how much is literal.