Revelation 6:10-11

And they cried with a loud voice, saying, How long, O Lord, holy and true, dost thou not judge and avenge our blood on those that dwell in the earth? And white robes were given unto each one of them; and it was said unto them, that they should rest yet for a little while until their fellow servants and their brethren, that should be killed as they were, should be fulfilled.