Daily a new Bible text for devotion - EZBB
Revelation 7:13-15

One of the elders (Rev. 4:4) offered to explain the vision to John. He first asked a twofold question about those who were dressed in white robes: WHO ARE THESE AND WHENCE HAVE THEY COME? John answered: SIR, YOU KNOW. Those who want to receive knowledge cannot be ashamed to acknowledge their ignorance, nor to desire instruction from anyone who is able to give it.
Then comes the explanation: THESE ARE THEY WHO COME OUT OF THE GREAT TRIBULATION – They had been persecuted by men, tempted by Satan, sometimes troubled in their own spirit; they had suffered the plundering of their possessions, the imprisonment of their person, yes, the loss of their very being. The path to eternal life passes through many tribulations; tribulation, when overcome, will make eternal life more desirable and more glorious.
They washed their robes and made them white in the blood of the Lamb – The idea of the robes being literally washed to become white in the blood is paradoxical. The blood of others stains; this is the only blood that makes the robes of the saints white and pure.
Verse 15. Therefore they are before the throne of God, and serve Him day and night in His temple. The throne of God is a place of rest, but not of laziness or inactivity. The throne of God is a place of service, though not of suffering; the consecration of one's whole life to the service of God is a goal toward which our present worship points.