Katzpur
Not your average Mormon
Referee stepping in here. Mestemia just scored a point. It is definitely a popular belief among Mormons (and I have explained the reasoning behind the belief thoroughly here), but the only definitive source of validating "doctrine" is the Standard Works. This is a commonly accepted belief among Latter-day Saints, and it may very well come up from time to time in church talks and lessons. What it is, is commentary on the Book of Mormon. Period. Zomg knows that as well as I do. You'll have to cut him some slack. He's just not used to playing for the other team yet.Except that you did not provide any proof that it is Mormon Doctrine.
You provided that it is a popular belief amongst Mormons, but not that it is actual Mormon Doctrine.