Revelation 7:14

And I say unto him, My lord, thou knowest. And he said to me, These are they that come of the great tribulation, and they washed their robes, and made them white in the blood of the Lamb.

1 John 1:7

but if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus his Son cleanseth us from all sin.

Zechariah 3:3-5

Now Joshua was clothed with filthy garments, and was standing before the angel.

Hebrews 9:14

how much more shall the blood of Christ, who through the eternal Spirit offered himself without blemish unto God, cleanse your conscience from dead works to serve the living God?

Isaiah 1:18

Come now, and let us reason together, saith Jehovah: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool.

Revelation 1:5

and from Jesus Christ, who is the faithful witness, the firstborn of the dead, and the ruler of the kings of the earth. Unto him that loveth us, and loosed us from our sins by his blood;

Revelation 22:14

Blessed are they that wash their robes, that they may have the right to come to the tree of life, and may enter in by the gates into the city.

Exodus 37:3

And he cast for it four rings of gold, in the four feet thereof; even two rings on the one side of it, and two rings on the other side of it.

Zechariah 13:1

In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem, for sin and for uncleanness.

Matthew 24:21

for then shall be great tribulation, such as hath not been from the beginning of the world until now, no, nor ever shall be.

John 13:8-14

Peter saith unto him, Thou shalt never wash my feet. Jesus answered him, If I wash thee not, thou hast no part with me.

John 16:33

These things have I spoken unto you, that in me ye may have peace. In the world ye have tribulation: but be of good cheer; I have overcome the world.

Acts 14:22

confirming the souls of the disciples, exhorting them to continue in the faith, and that through many tribulations we must enter into the kingdom of God.

Romans 5:3

And not only so, but we also rejoice in our tribulations: knowing that tribulation worketh stedfastness;

1 Corinthians 6:11

And such were some of you: but ye were washed, but ye were sanctified, but ye were justified in the name of the Lord Jesus Christ, and in the Spirit of our God.

Ephesians 5:26-27

that he might sanctify it, having cleansed it by the washing of water with the word,

2 Thessalonians 1:4

so that we ourselves glory in you in the churches of God for your patience and faith in all your persecutions and in the afflictions which ye endure;

Hebrews 13:12

Wherefore Jesus also, that he might sanctify the people through his own blood, suffered without the gate.

1 Peter 1:19

but with precious blood, as of a lamb without spot, even the blood of Christ:

Revelation 2:9

I know thy tribulation, and thy poverty (but thou art rich), and the blasphemy of them that say they are Jews, and they art not, but are a synagogue of Satan.

Revelation 5:9

And they sing a new song, saying, Worthy art thou to take the book, and to open the seals thereof: for thou was slain, and didst purchase unto God with thy blood men of every tribe, and tongue, and people, and nation,

Revelation 6:9-11

And when he opened the fifth seal, I saw underneath the altar the souls of them that had been slain for the word of God, and for the testimony which they held:

Revelation 12:11

And they overcame him because of the blood of the Lamb, and because of the word of their testimony; and they loved not their life even unto death.

Revelation 15:2

And I saw as it were a sea of glass mingled with fire; and them that come off victorious from the beast, and from his image, and from the number of his name, standing by the sea of glass, having harps of God.

Revelation 17:6

And I saw the woman drunken with the blood of the saints, and with the blood of the martyrs of Jesus. And when I saw her, I wondered with a great wonder.

Treasury of Scripture Knowledge

Summary

And I said unto him, Sir, thou knowest. And he said to me, These are they which came out of great tribulation, and have washed their robes, and made them white in the blood of the Lamb.

Bible References

Thou

Exodus 37:3
And he cast for it four rings of gold, in the four feet thereof; even two rings on the one side of it, and two rings on the other side of it.

And have

Revelation 1:5
and from Jesus Christ, who is the faithful witness, the firstborn of the dead, and the ruler of the kings of the earth. Unto him that loveth us, and loosed us from our sins by his blood;
Isaiah 1:18
Come now, and let us reason together, saith Jehovah: though your sins be as scarlet, they shall be as white as snow; though they be red like crimson, they shall be as wool.
Zechariah 3:3
Now Joshua was clothed with filthy garments, and was standing before the angel.
Zechariah 13:1
In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem, for sin and for uncleanness.
John 13:8
Peter saith unto him, Thou shalt never wash my feet. Jesus answered him, If I wash thee not, thou hast no part with me.
1 Corinthians 6:11
And such were some of you: but ye were washed, but ye were sanctified, but ye were justified in the name of the Lord Jesus Christ, and in the Spirit of our God.
Ephesians 5:26
that he might sanctify it, having cleansed it by the washing of water with the word,
Hebrews 9:14
how much more shall the blood of Christ, who through the eternal Spirit offered himself without blemish unto God, cleanse your conscience from dead works to serve the living God?
1 John 1:7
but if we walk in the light, as he is in the light, we have fellowship one with another, and the blood of Jesus his Son cleanseth us from all sin.

The blood

Revelation 5:9
And they sing a new song, saying, Worthy art thou to take the book, and to open the seals thereof: for thou was slain, and didst purchase unto God with thy blood men of every tribe, and tongue, and people, and nation,
Revelation 12:11
And they overcame him because of the blood of the Lamb, and because of the word of their testimony; and they loved not their life even unto death.
Hebrews 13:12
Wherefore Jesus also, that he might sanctify the people through his own blood, suffered without the gate.
1 Peter 1:19
but with precious blood, as of a lamb without spot, even the blood of Christ:

General references

Genesis 22:8
And Abraham said, God will provide himself the lamb for a burnt-offering, my son. So they went both of them together.
Leviticus 15:5
And whosoever toucheth his bed shall wash his clothes, and bathe himself in water, and be unclean until the even.
Zechariah 3:3
Now Joshua was clothed with filthy garments, and was standing before the angel.
Matthew 5:4
Blessed are they that mourn: for they shall be comforted.

American Standard Version Public Domain