Revelation 6:10-11

and they cried out with a loud voice, saying, “How long, O Lord, holy and true, will You refrain from judging and avenging our blood on those who live on the earth?” And a white robe was given to each of them; and they were told that they were to rest for a little while longer, until the number of their fellow servants and their brothers and sisters who were to be killed even as they had been, was completed also.