Revelation 6:9-11

The fifth seal was opened and John saw the souls of those slain for the word of God, and the testimony which they held. Where were they? Under the altar in heaven, which doubtless means at the foot of the altar. Who were these martyrs? The saints that had recently fallen in the persecutions; very likely Antipas, from the church of Pergamos, being one of them. What were they doing? Praying and saying: "How long dost thou not avenge us and punish these murderers on earth?" which would indicate that these persecutors were still alive on earth. It would seem to them, and naturally, that truth was being destroyed; the church killed; and every thing that was just and right was being outraged, and the people of God suffering as if God had forgotten. So they pray: How long, O Lord, how long?

How was their prayer answered? White robes were given them showing that they had conquered and were approved; and perhaps this suggested that their cause on earth would likewise eventually triumph. But they were told that it would be a little while yet before judgment fell on their persecutors, and that a few more martyrs would fall and join them before the carnage would cease. This would be assurance both to those in heaven and on earth, that although the persecution was severe, it would be short and their triumph sure. Christ had already said: "For the elect's sake those days shall be shortened."