It has been generally accepted that the LDS endowment ceremonies are based on Masonic ceremonies Joseph learned in the 1840s.  However, historian Don Bradley says there are clues to masonry in the Book of Mormon’s lost pages that are also related to the LDS temple endowment ceremonies.

Don:  This [non-Mormon] Fayette Lapham guy, he’s not just confabulating. He’s remembering what Joseph, Sr. told him and the narrative that he gives has everything to do with temples.  It’s Nauvoo endowment stuff. The thing is, Lapham was never a Mormon, was never a Latter-day Saint.  He wouldn’t come through the temple. At this time, neither would Joseph, Sr.  Joseph, Sr. never goes through the Nauvoo Temple.  He dies before the endowment is instituted. So why is there Nauvoo endowment material in the lost pages of the Book of Mormon narrative translated in 1828? Joseph Smith doesn’t become a Freemason until 1842. That’s 14 years later. I had been absolutely convinced that Joseph didn’t know anything about the Nauvoo endowment until he becomes a Freemason in March 1842.
GT:  Yeah, that’s the traditional story.
Don:  I thought, “[Joseph became] Freemason in mid-March 1842. In early May like five weeks later, [we have the] endowment.”  You sort of connect the dots. Sure, that’s causation. This is what I was thinking. I’m not saying they’re unrelated, but Joseph has much of the structure and content of the Nauvoo endowment in his mind, as he’s bringing forth the Book of Mormon in 1828, because so much of it’s already there.  In my mind, this was interweaving with the different narratives about the First Vision that I had, different pieces of evidence about what was in it. I was looking at parallel narratives in Latter-day Saints scripture.  Abraham, Enoch, Moses, how did they become seers? The brother of Jared is the big one. So the brother of Jared, I’d never read this narrative this way. We don’t read it this way. But think about this.  I just told the narrative from Joseph Smith, Sr. of how the Nephites got the interpreters.  How did the Jaredites get the interpreters? Ether 3 says, “The Brother of Jared,” whose name, by the way is withheld from us, right? It’s secret. It’s esoteric. There’s sort of like an idea of secret, sacred names.
GT:  Mahonri Moriancumer.
Don:  Later that’s revealed, but it’s deliberately withheld. So we call this guy “the brother of Jared” in the narrative. The brother of Jared goes up on a mountaintop while he’s on an exodus, kind of like Sinai, right? Joseph Smith in Nauvoo says anciently mountaintops were temples.  When God’s people didn’t have the means to build the temple, like in the days of Moses and the Exodus, he says, God accepted mountaintops as the place to give people keys, to give the endowment.  Joseph says this explicitly in a Nauvoo sermon and I quote the exact sermon in my book, in chapter 14 about Mosiah the First.  So the brother of Jared is on a mountaintop. That should cue temple. He talks with the Lord through the veil. It doesn’t mean a cloth veil, of course, like in the temple, it means the veil that that cloth veil represents. But he hasn’t dialogue with the Lord through what it calls the veil.  I don’t know that sounds kind of familiar to me.
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