Revelation 11:3

And I will authorize My two witnesses to prophesy for 1,260 days, clothed in sackcloth.

Revelation 11:2

But as for the court which is outside the sanctuary, pass it over. Do not measure it; for it has been given to the Gentiles, and for forty-two months they will trample the holy city under foot.

Revelation 12:6

and the woman fled into the Desert, there to be cared for, for 1,260 days, in a place which God had prepared for her.

Matthew 18:16

But if he will not listen to you, go again, and ask one or two to go with you, that every word spoken may be attested by two or three witnesses.

Luke 24:48

You are witnesses as to these things.

John 3:5-8

"In most solemn truth I tell you," replied Jesus, "that unless a man is born of water and the Spirit, he cannot enter the Kingdom of God.

John 3:27

"A man cannot obtain anything," replied John, "unless it has been granted to him from Heaven.

John 15:27

And you also are witnesses, because you have been with me from the first.

Acts 1:8

and yet you will receive power when the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem and in all Judaea and Samaria and to the remotest parts of the earth."

Acts 2:32

This Jesus, God has raised to life-- a fact to which all of us testify.

Acts 3:15

The Prince of Life you put to death; but God has raised Him from the dead, and we are witnesses as to that.

Acts 13:31

And, after a few days, He appeared to the people who had gone up with Him from Galilee to Jerusalem and are now witnesses concerning Him to the Jews.

1 Corinthians 12:28

And by God's appointment there are in the Church--first Apostles, secondly Prophets, thirdly teachers. Then come miraculous powers, and then ability to cure diseases or render loving service, or powers of organization, or varieties of the gift of 'tongues.'

2 Corinthians 13:1

This intended visit of mine is my third visit to you. "On the evidence of two or three witnesses every charge shall be sustained."

Ephesians 4:11

And He Himself appointed some to be Apostles, some to be Prophets, some to be evangelists, some to be pastors and teachers,

Revelation 1:5

and from Jesus Christ, the truthful witness, the first of the dead to be born to Life, and the Ruler of the kings of the earth. To Him who loves us and has freed us from our sins with His own blood,

Revelation 13:5

And there was given him a mouth full of boastful and blasphemous words; and liberty of action was granted him for forty-two months.

Revelation 19:10

Then I fell at his feet to worship him. But he exclaimed, "Oh, do not do that. I am a fellow bondservant of yours and a fellow bondservant of your brethren who have borne testimony to Jesus. Worship God." Testimony to Jesus is the spirit which underlies Prophecy.

Revelation 20:4

And I saw thrones, and some who were seated on them, to whom judgment was entrusted. And I saw the souls of those who had been beheaded on account of the testimony that they had borne to Jesus and on account of God's Message, and also the souls of those who had not worshipped the Wild Beast or his statue, nor received his mark on their foreheads or on their hands; and they came to Life and were kings with Christ for a thousand years.

Treasury of Scripture Knowledge

Summary

And I will give power unto my two witnesses, and they shall prophesy a thousand two hundred and threescore days, clothed in sackcloth.

They shall

Clothed

General references

Bible References

I will give power, etc

John 3:27
"A man cannot obtain anything," replied John, "unless it has been granted to him from Heaven.
1 Corinthians 12:28
And by God's appointment there are in the Church--first Apostles, secondly Prophets, thirdly teachers. Then come miraculous powers, and then ability to cure diseases or render loving service, or powers of organization, or varieties of the gift of 'tongues.'
Ephesians 4:11
And He Himself appointed some to be Apostles, some to be Prophets, some to be evangelists, some to be pastors and teachers,

Witnesses

Revelation 20:4
And I saw thrones, and some who were seated on them, to whom judgment was entrusted. And I saw the souls of those who had been beheaded on account of the testimony that they had borne to Jesus and on account of God's Message, and also the souls of those who had not worshipped the Wild Beast or his statue, nor received his mark on their foreheads or on their hands; and they came to Life and were kings with Christ for a thousand years.
Luke 24:48
You are witnesses as to these things.
John 15:27
And you also are witnesses, because you have been with me from the first.
Acts 1:8
and yet you will receive power when the Holy Spirit has come upon you, and you will be my witnesses in Jerusalem and in all Judaea and Samaria and to the remotest parts of the earth."
Acts 2:32
This Jesus, God has raised to life-- a fact to which all of us testify.
Acts 3:15
The Prince of Life you put to death; but God has raised Him from the dead, and we are witnesses as to that.
Acts 13:31
And, after a few days, He appeared to the people who had gone up with Him from Galilee to Jerusalem and are now witnesses concerning Him to the Jews.

They shall

Revelation 19:10
Then I fell at his feet to worship him. But he exclaimed, "Oh, do not do that. I am a fellow bondservant of yours and a fellow bondservant of your brethren who have borne testimony to Jesus. Worship God." Testimony to Jesus is the spirit which underlies Prophecy.

A thousand

Revelation 11:2
But as for the court which is outside the sanctuary, pass it over. Do not measure it; for it has been given to the Gentiles, and for forty-two months they will trample the holy city under foot.
Revelation 12:6
and the woman fled into the Desert, there to be cared for, for 1,260 days, in a place which God had prepared for her.

Clothed

John 3:5
"In most solemn truth I tell you," replied Jesus, "that unless a man is born of water and the Spirit, he cannot enter the Kingdom of God.

General references

Romans 9:2
when I declare that I have deep grief and unceasing anguish of heart.