Revelation 6:10

And they cried with a great voice, saying, How long, O Lord, holy and true, do you not judge and avenge our blood from those who dwell upon the earth?

Revelation 18:20-24

Rejoice over her, O heaven, and the saints, and the apostles, and the prophets; because God has judged your judgment from her.

Treasury of Scripture Knowledge

Summary

Because thou hast spoiled many nations, all the remnant of the people shall spoil thee; because of men's blood, and for the violence of the land, of the city, and of all that dwell therein.

Bible References

The violence

Revelation 6:10
And they cried with a great voice, saying, How long, O Lord, holy and true, do you not judge and avenge our blood from those who dwell upon the earth?
Revelation 18:20
Rejoice over her, O heaven, and the saints, and the apostles, and the prophets; because God has judged your judgment from her.