Revelation 7:14

my Lord, answer'd I, you can tell. and he said to me, these are they who came out of great tribulation, and have 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 society one with another, and the blood of his son Jesus Christ cleanseth us from all sin.

Hebrews 9:14

how much more shall the blood of Christ, who through the holy spirit offered himself a spotless victim to God, purify our souls from deadly sins, to serve the living God?

Revelation 1:5

and from Jesus Christ, who is the faithful witness, the first-born of the dead, and the prince of the kings of the earth: unto him that loved us, and washed us from our sins by his own blood,

Revelation 22:14

blessed are they who wash their robes, that they may have right to the tree of life, and may enter in through the gates into the city."

Matthew 24:21

for the desolation will be so dreadful, the like was never seen since the beginning of the world, no, nor ever shall be again.

John 13:8-14

Peter said to him, you shall never wash my feet. Jesus answered, if I do not cleanse thee, you cannot partake with me.

John 16:33

these things I have appriz'd you of, that ye might repose your confidence in me. the world shall give you trouble: but take courage, I have overcome the world.

Acts 14:22

encouraging the disciples, exhorting them to persevere in the faith, representing that it is thro' much tribulation that we must enter into the kingdom of God.

Romans 5:3

and not only so, but we triumph in tribulation also, knowing that tribulation worketh patience; and patience, probation;

1 Corinthians 6:11

and such were some of you: but you have been washed, you have been sanctified, you have been justified in the name of the Lord Jesus Christ, and by the spirit of our God.

Ephesians 5:26-27

to sanctify and purify her by the ablution of his word,

2 Thessalonians 1:4

so that you are the subject of our glorying in the churches of God, for the constancy of your faith, under all the persecutions and afflictions you endure from men,

Hebrews 13:12

for Jesus likewise suffered without the gate, to show he was the expiatory victim for the people.

1 Peter 1:19

but by the precious blood of Christ, who is the lamb without spot, and without blemish:

Revelation 2:9

"I know thy works, thy tribulation and poverty (tho' thou art rich) and I know the blasphemy of those who say they are Jews, and are not, but are the synagogue of satan.

Revelation 5:9

and they sung a new song, saying, "thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood, out of every tribe, and language, and people, and nation;

Revelation 6:9-11

When he had opened the fifth seal, I saw under the altar the souls of those that were slain for the word of God, and for the testimony which they maintain'd.

Revelation 12:11

they overcame him by the blood of the lamb, and by the word to which they gave testimony; for their lives they expos'd to the last.

Revelation 15:2

and I saw as it were a sea of glass, mingled with fire; and those that had been victorious over the beast, and over his image, and over the number of his name, standing on the sea of glass, with their divine harps in their hands.

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 wondred with great admiration.

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.

General references

Bible References

And have

Revelation 1:5
and from Jesus Christ, who is the faithful witness, the first-born of the dead, and the prince of the kings of the earth: unto him that loved us, and washed us from our sins by his own blood,
John 13:8
Peter said to him, you shall never wash my feet. Jesus answered, if I do not cleanse thee, you cannot partake with me.
1 Corinthians 6:11
and such were some of you: but you have been washed, you have been sanctified, you have been justified in the name of the Lord Jesus Christ, and by the spirit of our God.
Ephesians 5:26
to sanctify and purify her by the ablution of his word,
Hebrews 9:14
how much more shall the blood of Christ, who through the holy spirit offered himself a spotless victim to God, purify our souls from deadly sins, to serve the living God?
1 John 1:7
but if we walk in the light, as he is in the light, we have society one with another, and the blood of his son Jesus Christ cleanseth us from all sin.

The blood

Revelation 5:9
and they sung a new song, saying, "thou art worthy to take the book, and to open the seals thereof: for thou wast slain, and hast redeemed us to God by thy blood, out of every tribe, and language, and people, and nation;
Revelation 12:11
they overcame him by the blood of the lamb, and by the word to which they gave testimony; for their lives they expos'd to the last.
Hebrews 13:12
for Jesus likewise suffered without the gate, to show he was the expiatory victim for the people.
1 Peter 1:19
but by the precious blood of Christ, who is the lamb without spot, and without blemish:

General references

Matthew 5:4
Blessed are they that mourn: for they shall be comforted.