The Bible was written primarily by those of the tribe of Judah. The Book of Mormon was written primarily by those of the tribe of Joseph. This doctrine is also taught in Ezekiel 37:16-17, Moreover, thou son of man, take thee one stick, and write upon it, For Judah, and for the children of Israel his companions: then take another stick, and write upon it, For Joseph, the stick of Ephraim, and for all the house of Israel his companions; And join them one to another into one stick; and they shall become one in thine hand. Both Joseph and Ezekiel speak of these two great records, then speak of the gathering of the house of Israel. The coming forth of the Book of Mormon was a necessary prerequisite for the gathering of Israel. It is the primary tool through which the convert learns of the promises made to the house of Israel and begins to understand the ways in which they are currently being fulfilled. Ezekiel goes on in chapter 38 to talk about Gog of Magog and the destructions which will precede the Second Coming. This shows how closely related, both temporally and doctrinally, these events are.