The Four Horsemen of the Apocalypse appear in the New Testament’s last book, the Book of Revelation written by John of Patmos. In God`s right hand is a scroll that is sealed with seven seals. The Lamb of God (Jesus) opens the first four of the seven seals, summoning four terrible beings that ride out on white, red, black, and pale horses.
These four riders bring upon the world the divine apocalypse and are released upon humanity as harbingers of the Last Judgment. During the End of Times, humanity will encounter these horsemen and will know death, disease, famine, and many more trials.
Pestilence — Revelation 6:1-2
The next thing I saw was this. When the lamb had opened one of the seven seals, I heard one of the four living creatures say in a voice like thunder, ‘Come!’ And, as I watched, there was a white horse. Its rider was holding a bow. He was given a crown, and he went off winning victories, and to win more of them.