Revelation 11:3

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

Revelation 11:2

But leave the outer court of the temple, and measure it not, for it is given to the gentiles: and they shall trample on the holy city forty two months.

Revelation 12:6

And the woman fled into the wilderness, where she hath a place prepared of God, that they might nourish her there a thousand two hundred and sixty days.

Matthew 18:16

but if he regard thee not, take with thee one or two more, that in the mouth of two or three witnesses every word may be established.

Luke 24:48

And ye are witnesses of these things: and I will send upon you the promise of my Father;

John 3:5-8

Jesus answered, I tell thee of a truth, Unless a man be born of water and of the Spirit, he cannot enter into the kingdom of God.

John 3:27

John answered and said, A man can take nothing upon him, unless it be given him from heaven.

John 15:27

And ye also shall bear witness, because ye have been with me from the beginning.

Acts 1:8

But ye shall receive power from the holy Spirit coming upon you: and ye shall be my witnesses both in Jerusalem, and in all Judea, and Samaria, and to the uttermost part of the earth.

Acts 2:32

This Jesus hath God raised up from the dead, of which we all are witnesses.

Acts 3:15

and put to death the prince of life; whom God hath raised from the dead, of which we are witnesses.

Acts 13:31

and He was seen for many days by those that came up with Him from Galilee to Jerusalem, who are his witnesses to the people.

1 Corinthians 12:28

And God hath placed you accordingly in the church, first apostles, secondly prophets, thirdly teachers, after that miraculous powers, then gifts of healing, helps, governments, and various kinds of tongues.

2 Corinthians 13:1

This, I say, is the third time I am coming to you: and at the mouth of two or three witnesses shall every word be established.

Ephesians 4:11

And therefore He gave some to be apostles, some prophets, some evangelists, and some pastors and teachers; to qualify holy men for the work of the ministry,

Revelation 1:5

and from Jesus Christ, who is the faithful witness, the first-born from the dead, and the ruler of the kings of the earth. To Him that loved us, and washed us from our sins in his own blood,

Revelation 13:5

And there was given him a mouth speaking great and blasphemous things, and power was given him to make war forty two months.

Revelation 19:10

And I fell at his feet to worship him: and he said unto me, See thou do it not: I am thy fellow-servant, and a fellow-servant of thy brethren, that hold the testimony of Jesus. Worship God. For the Spirit of prophecy is the testimony of Jesus.

Revelation 20:4

And I saw thrones, and persons sat on them, and judgement was given to them: and I saw the souls of those who had been beheaded for the testimony of Jesus, and for the word of God; and who had not worshipped the beast, nor his image, and received not his mark upon their forehead, and on their hands; and they lived and reigned with Christ 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
John answered and said, A man can take nothing upon him, unless it be given him from heaven.
1 Corinthians 12:28
And God hath placed you accordingly in the church, first apostles, secondly prophets, thirdly teachers, after that miraculous powers, then gifts of healing, helps, governments, and various kinds of tongues.
Ephesians 4:11
And therefore He gave some to be apostles, some prophets, some evangelists, and some pastors and teachers; to qualify holy men for the work of the ministry,

Witnesses

Revelation 20:4
And I saw thrones, and persons sat on them, and judgement was given to them: and I saw the souls of those who had been beheaded for the testimony of Jesus, and for the word of God; and who had not worshipped the beast, nor his image, and received not his mark upon their forehead, and on their hands; and they lived and reigned with Christ a thousand years.
Luke 24:48
And ye are witnesses of these things: and I will send upon you the promise of my Father;
John 15:27
And ye also shall bear witness, because ye have been with me from the beginning.
Acts 1:8
But ye shall receive power from the holy Spirit coming upon you: and ye shall be my witnesses both in Jerusalem, and in all Judea, and Samaria, and to the uttermost part of the earth.
Acts 2:32
This Jesus hath God raised up from the dead, of which we all are witnesses.
Acts 3:15
and put to death the prince of life; whom God hath raised from the dead, of which we are witnesses.
Acts 13:31
and He was seen for many days by those that came up with Him from Galilee to Jerusalem, who are his witnesses to the people.

They shall

Revelation 19:10
And I fell at his feet to worship him: and he said unto me, See thou do it not: I am thy fellow-servant, and a fellow-servant of thy brethren, that hold the testimony of Jesus. Worship God. For the Spirit of prophecy is the testimony of Jesus.

A thousand

Revelation 11:2
But leave the outer court of the temple, and measure it not, for it is given to the gentiles: and they shall trample on the holy city forty two months.
Revelation 12:6
And the woman fled into the wilderness, where she hath a place prepared of God, that they might nourish her there a thousand two hundred and sixty days.

Clothed

John 3:5
Jesus answered, I tell thee of a truth, Unless a man be born of water and of the Spirit, he cannot enter into the kingdom of God.

General references

Romans 9:2
that I have great grief and continual sorrow in my heart: