And I said unto him, Sir, you know. And he said to me, These are they who came out of the great tribulation, and have washed their robes, and made them white in the blood of the Lamb.
Read Chapter 7
Bede
AD 735
washed: He speaks not of martyrs alone. They are washed in their own blood. But the blood of Jesus, the Son of God, cleanses the whole Church from all sin, therefore are they before the throne of God. For they are accounted worthy to stand there together in the service of God, who in the midst of adverse things are faithful confessors of His Name. <a
tribulation: "Through many tribulations we must enter into the kingdom of God," but who knows not that the tribulation of Antichrist will be greater than all the rest?
For if I were to give a man a garment finished and ready, it would be my garment that another was making use of, and probably the thing made for another would be found little fitting for his figure of stature and body. But now I have sent you the very wool and the purple
White in the blood of the Lamb. That is, they have been cleansed and purified from sin, by the death, merits, and grace of Christ crucified. (Witham)
The whole of this verse must be understood in a mystical sense, for we are said to make our garments white in the blood of the Lamb, when we enter into his Church by baptism, or wash away our sins by penance or martyrdom. (Calmet)
For yet again a countless throng are revealed, clothed in white and distinguished by palms of victory, celebrating their triumph doubtless over Antichrist, since one of the elders says, "These are they who come out of that great tribulation, and have washed their robes, and made them white in the blood of the Lamb."