Revelation 11:3

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

Revelation 11:2

But leave out the court which is within the temple and measure it not, for it is given unto the Gentiles, and the holy city shall they tread under foot forty-two months.

Revelation 12:6

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

Genesis 37:34

Then Jacob rent his clothes and put sackcloth upon his loins and mourned for his son many days.

Numbers 11:26

But there remained two of the men in the camp, the name of the one was Eldad and the name of the other Medad, upon whom the spirit also rested; and they were of those that were written, but they had not gone unto the tabernacle; and they began to prophesy in the camp.

Deuteronomy 17:6

At the mouth of two witnesses or three witnesses shall he that is worthy of death be put to death, but at the mouth of one witness he shall not be put to death.

Deuteronomy 19:15

One witness shall not be valid against a man for any iniquity or for any sin, in any sin which he should commit. At the mouth of two witnesses or at the mouth of three witnesses, shall the matter be established.

1 Chronicles 21:16

And David lifted up his eyes and saw the angel of the LORD stand between the heaven and the earth, having a drawn sword in his hand stretched out over Jerusalem. Then David and the elders of Israel, who were clothed in sackcloth, fell upon their faces.

Esther 4:1-2

When Mordecai perceived all that was done, Mordecai rent his clothes and put on sackcloth with ashes and went out into the midst of the city and cried with a loud and a bitter cry

Job 16:15

I have sewn sackcloth upon my skin and put dust over my head.

Isaiah 22:12

Therefore the Lord GOD of the hosts did call in this day unto weeping and to mourning and to baldness and to girding with sackcloth:

Lamentations 2:10

Jod The elders of the daughter of Zion sat upon the ground and are silent: they have cast up dust upon their heads; they have girded themselves with sackcloth; the daughters of Jerusalem hung their heads down to the ground.

Daniel 12:7

And I heard the Man clothed in linens, who was upon the waters of the river, who raised his right hand and his left hand unto heaven, and swore by the living one in the ages that it shall be for a time, times, and a half; and when the scattering of the power of the holy people shall be finished, all these things shall be fulfilled.

Matthew 18:16

But if he will not hear thee, then 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.

John 3:5-8

Jesus answered, Verily, verily, I say unto thee, Unless a man is 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 receive nothing except it is given him from the 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 the virtue of the Holy Spirit which shall come upon you, and ye shall be witnesses unto me both in Jerusalem and in all Judaea and in Samaria and unto the uttermost part of the earth.

Acts 2:32

This Jesus God has raised up, of whom we all are witnesses.

Acts 3:15

and killed the Author of life, whom God has raised from the dead, of which we are witnesses.

Acts 13:31

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

1 Corinthians 12:28

And God did set certain ones in the congregation : first apostles, secondarily prophets, thirdly teachers, after that faculties, then gifts of healings, helps, governments, diversities of tongues.

2 Corinthians 13:1

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

Ephesians 4:11

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

Revelation 1:5

and from Jesus, the Christ, who is the faithful witness and the first begotten of the dead and the prince of the kings of the earth. Unto him that loved us and washed us from our sins with his own blood

Revelation 13:5

And there was given unto it a mouth speaking great things and blasphemies; and power was given unto it to continue forty and 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 fellowservant and with thy brethren that have the testimony of Jesus; worship God; for the testimony of Jesus is the spirit of prophecy.

Revelation 20:4

And I saw thrones, and those who sat upon them, and judgment was given unto them; and I saw the souls of those that were beheaded for the witness of Jesus and for the word of God and who had not worshipped the beast neither its image neither had received its mark upon their foreheads or in their hands; and they shall live and reign with Christ the 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

Bible References

I will give power, etc

John 3:27
John answered and said, A man can receive nothing except it is given him from the heaven.
1 Corinthians 12:28
And God did set certain ones in the congregation : first apostles, secondarily prophets, thirdly teachers, after that faculties, then gifts of healings, helps, governments, diversities of tongues.
Ephesians 4:11
And he gave some, apostles; and some, prophets; and some, evangelists; and some, pastors and teachers,

Witnesses

Revelation 20:4
And I saw thrones, and those who sat upon them, and judgment was given unto them; and I saw the souls of those that were beheaded for the witness of Jesus and for the word of God and who had not worshipped the beast neither its image neither had received its mark upon their foreheads or in their hands; and they shall live and reign with Christ the thousand years.
Luke 24:48
And ye are witnesses of these things.
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 the virtue of the Holy Spirit which shall come upon you, and ye shall be witnesses unto me both in Jerusalem and in all Judaea and in Samaria and unto the uttermost part of the earth.
Acts 2:32
This Jesus God has raised up, of whom we all are witnesses.
Acts 3:15
and killed the Author of life, whom God has raised from the dead, of which we are witnesses.
Acts 13:31
and he was seen many days by those who came up with him from Galilee to Jerusalem, who until now are his witnesses unto 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 fellowservant and with thy brethren that have the testimony of Jesus; worship God; for the testimony of Jesus is the spirit of prophecy.

A thousand

Revelation 11:2
But leave out the court which is within the temple and measure it not, for it is given unto the Gentiles, and the holy city shall they tread under foot forty-two months.
Revelation 12:6
And the woman fled into the wilderness, where she has a place prepared of God, that they should feed her there a thousand two hundred and sixty days.

Clothed

Genesis 37:34
Then Jacob rent his clothes and put sackcloth upon his loins and mourned for his son many days.
1 Chronicles 21:16
And David lifted up his eyes and saw the angel of the LORD stand between the heaven and the earth, having a drawn sword in his hand stretched out over Jerusalem. Then David and the elders of Israel, who were clothed in sackcloth, fell upon their faces.
Esther 4:1
When Mordecai perceived all that was done, Mordecai rent his clothes and put on sackcloth with ashes and went out into the midst of the city and cried with a loud and a bitter cry
Job 16:15
I have sewn sackcloth upon my skin and put dust over my head.
Isaiah 22:12
Therefore the Lord GOD of the hosts did call in this day unto weeping and to mourning and to baldness and to girding with sackcloth:
Lamentations 2:10
Jod The elders of the daughter of Zion sat upon the ground and are silent: they have cast up dust upon their heads; they have girded themselves with sackcloth; the daughters of Jerusalem hung their heads down to the ground.
John 3:5
Jesus answered, Verily, verily, I say unto thee, Unless a man is born of water and of the Spirit, he cannot enter into the kingdom of God.

General references

Genesis 37:34
Then Jacob rent his clothes and put sackcloth upon his loins and mourned for his son many days.
Numbers 35:30
Whoever kills any person, the murderer shall be put to death by the mouth of witnesses, but one witness shall not testify against any person to cause him to die.
Romans 9:2
that I have great sorrow and continual pain in my heart.