The fifth seal

9 ¶ And when He had opened the fifth seal, I saw under the altar the souls of them that were slain for the Word of God, and for the testimony which they held.
10 And they cried with a loud voice, saying, "How long, O Lord, holy and true, dost Thou not judge and avenge our blood on them that dwell on the earth?"
11 And white robes were given unto every one of them, and it was said unto them that they should rest yet for a little season, until their fellow servants and also their brethren, who were to be killed as they were, should be fulfilled. (Revelation 6:9-11)