Revelation 6:9-11 - The Fifth Seal
9 And when he opened the fifth seal I saw underneath the altar the souls of those who had been slain for the word of God, and for the testimony which they maintained. 10 And they cried with a loud voice, How long will it be, O sovereign, the holy one and the true, ere thou judge and avenge our blood on those who dwell on the earth? 11 And to each of them were given white robes, and it was told them that they should wait yet a little longer space, until the number of their fellow-servants and their brethren, who should be slain as well as they, should be completed.