Revelation 6:9-11 Amplified Bible (AMP)
The Fifth Seal—Martyrs
9 When He (the Lamb) broke open the fifth seal, I saw underneath the altar the souls of those who had been slaughtered because of the word of God, and because of the testimony which they had maintained [out of loyalty to Christ]. 10 They cried in a loud voice, saying, “O Lord, holy and true, how long now before You will sit in judgment and avenge our blood on those [unregenerate ones] who dwell on the earth?” 11 Then they were each given a white robe; and they were told to rest and wait quietly for a little while longer, until the number of their fellow servants and their brothers and sisters who were to be killed even as they had been, would be completed.
Revelation 6:9-11 New International Version (NIV)
9 When he opened the fifth seal, I saw under the altar the souls of those who had been slain because of the word of God and the testimony they had maintained. 10 They called out in a loud voice, “How long, Sovereign Lord, holy and true, until you judge the inhabitants of the earth and avenge our blood?” 11 Then each of them was given a white robe, and they were told to wait a little longer, until the full number of their fellow servants, their brothers and sisters,[a] were killed just as they had been.