Revelation 6:9-11 - The Fifth Seal
9 And when he opened the fifth seal, I saw under the altar the souls of the slain for the word of God, and for the testimony which they had: 10 And they cried with a great voice, saying, Till when, Lord, holy and true, dost thou not judge and avenge our blood of them dwelling upon earth 11 And to each were given white robes; and it was said to them, that they should rest for a little time, till also their fellowservants be filled up, about to be killed, as also they.