The seven seals is a concept foun in the Book of Revelation in the Bible which states that when the world reaches its end, seven seals will be opened. A book with seven seals is first mentioned in Revelation 5:1. In chapter 6, the first six seals are opened by The Lamb (presumably Jesus), one by one. Then 144,000 are sealed at chapter 7 in legions of 12,000. Chapter 8 begins with the opening of the seventh seal, and a gold censer with a gold altar of incense before God's throne (mercy seat). The first four of the seven seals are commonly referred to as the 4 horsemen / 4 horses of the Apocalypse.