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.
War — Revelation 6:3-4
When the lamb opened the second seal, I heard the second living creature say, ‘Come!’ And another horse went out, fiery red this time. Its rider was given permission to take peace away from the earth, so that people would kill one another. He was given a great sword.