Revelation 6:7-8

7Then when the Lamb opened the fourth seal I heard the voice of the fourth living creature saying, “Come!”

8So I looked and here came a pale green horse! The name of the one who rode it was Death, and Hades followed right behind. They were given authority over a fourth of the earth, to kill its population with the sword, famine, and disease, and by the wild animals of the earth.