Revelation 6:8-10 Modern English Version (MEV)
8 So I looked, and there was a pale horse, and the name of him who sat on it was Death, and Hades followed him. Power over a fourth of the earth was given to them, to kill with sword, with hunger, with death, and by the 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 testimony they had held. 10 They cried out with a loud voice, “How long, O Sovereign Lord, holy and true, until You judge and avenge our blood on those who dwell on the earth?”