Revelation 6:7-8 NIV

7 When the Lamb opened the fourth seal, I heard the voice of the fourth living creature1 say, "Come!"

References for Revelation 6:7

8 I looked, and there before me was a pale horse!2 Its rider was named Death, and Hades3 was following close behind him. They were given power over a fourth of the earth to kill by sword, famine and plague, and by the wild beasts of the earth.4

References for Revelation 6:8