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 the court which is outside the temple, leave out, and measure it not, for it hath been given to the gentiles; and the holy city will they tread under foot fortytwo months.

Revelation 12:6

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

Matthew 18:16

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

Luke 24:48

Ye are witnesses of these things.

John 3:5-8

Jesus answered, Truly, truly do I say to thee, Unless a man be born of water and of the Spirit, he cannot enter the kingdom of heaven.

John 3:27

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

John 15:27

And ye also are witnesses, because ye have been with me from the beginning.

Acts 1:8

But ye will receive power when the Holy Spirit hath come upon you; and ye will be my witnesses, both in Jerusalem and in all Judaea, and in Samaria, and to the end of the earth.

Acts 2:32

This Jesus God raised up, whereof we all are witnesses.

Acts 3:15

But the author of life ye killed; whom God raised from the dead, whereof we are witnesses.

Acts 13:31

and he was seen for many days by those who came up with him from Galilee to Jerusalem, who are now his witnesses to the people.

1 Corinthians 12:28

God appointed some in the church to be, in the first place, apostles, in the second place, prophets, in the third place, teachers, then miracles, then gifts of healing, those of helping and of governing, divers kinds of tongues. Are all apostles?

2 Corinthians 13:1

This is the third time I am coming to you. In the mouth of two or three witnesses shall every word be established.

Ephesians 4:11

And he gave some to be apostles; and some, prophets; and some, evangelists; and some, pastors and teachers;

Revelation 1:5

and from Jesus Christ, the faithful witness, the firstborn of the dead, and the ruler of the kings of the earth. To him that loveth us, and washed us from our sins in his own blood,

Revelation 13:5

And there was given to him a mouth speaking great things and blasphemy; and power was given to him to work fortytwo months.

Revelation 19:10

And I fell at his feet to worship him; and he saith to me, See thou do it not; I am a fellowservant of thee, and of thy brethren who maintain the testimony to Jesus; worship God. For the testimony to Jesus is the spirit of prophecy.

Revelation 20:4

And I saw thrones; and they sat on them, and judgment was given to them; and I saw the souls of those beheaded on account of the testimony to Jesus, and on account of the word of God, and of all who had not worshipped the beast, nor his image, and had not received his mark upon their forehead, or upon their hand; 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 receive nothing, unless it be given him from heaven.
1 Corinthians 12:28
God appointed some in the church to be, in the first place, apostles, in the second place, prophets, in the third place, teachers, then miracles, then gifts of healing, those of helping and of governing, divers kinds of tongues. Are all apostles?
Ephesians 4:11
And he gave some to be apostles; and some, prophets; and some, evangelists; and some, pastors and teachers;

Witnesses

Revelation 20:4
And I saw thrones; and they sat on them, and judgment was given to them; and I saw the souls of those beheaded on account of the testimony to Jesus, and on account of the word of God, and of all who had not worshipped the beast, nor his image, and had not received his mark upon their forehead, or upon their hand; and they lived, and reigned with Christ a thousand years.
Luke 24:48
Ye are witnesses of these things.
John 15:27
And ye also are witnesses, because ye have been with me from the beginning.
Acts 1:8
But ye will receive power when the Holy Spirit hath come upon you; and ye will be my witnesses, both in Jerusalem and in all Judaea, and in Samaria, and to the end of the earth.
Acts 2:32
This Jesus God raised up, whereof we all are witnesses.
Acts 3:15
But the author of life ye killed; whom God raised from the dead, whereof we are witnesses.
Acts 13:31
and he was seen for many days by those who came up with him from Galilee to Jerusalem, who are now his witnesses to the people.

They shall

Revelation 19:10
And I fell at his feet to worship him; and he saith to me, See thou do it not; I am a fellowservant of thee, and of thy brethren who maintain the testimony to Jesus; worship God. For the testimony to Jesus is the spirit of prophecy.

A thousand

Revelation 11:2
but the court which is outside the temple, leave out, and measure it not, for it hath been given to the gentiles; and the holy city will they tread under foot fortytwo months.
Revelation 12:6
And the woman fled into the wilderness, where she hath a place prepared by God, that they should nourish her there a thousand two hundred and sixty days.

Clothed

John 3:5
Jesus answered, Truly, truly do I say to thee, Unless a man be born of water and of the Spirit, he cannot enter the kingdom of heaven.

General references

Romans 9:2
I have great grief and unceasing anguish in my heart.