Ḥazon (Revelation) 6:10-11

and they cried with a loud voice, saying, “How long, O Master, set-apart and true, until You judge and avenge our blood on those who dwell on the earth?” And there was given to each one a white robe, and they were told that they should rest a little while longer, until both the number of their fellow servants and their brothers, who would be killed as they were, was completed.