Revelation 6:8-10 English Standard Version Anglicised (ESVUK)
8 And I looked, and behold, a pale horse! And its rider's name was Death, and Hades followed him. And they were given authority over a quarter of the earth, to kill with sword and with famine and with pestilence and by wild beasts of the earth.
9 When he opened the fifth seal, I saw under the altar the souls of those who had been slain for the word of God and for the witness they had borne. 10 They cried out with a loud voice, “O Sovereign Lord, holy and true, how long before you will judge and avenge our blood on those who dwell on the earth?”