“The Words Which Have Been Spoken… Since the World Began”

Joseph F. McConkie, Robert L. Millet
The brass plates contained an account of the words of the prophets and seers from the time of the Creation to the time of Lehi and Jeremiah, or, in other words, from about 4000 B.C. to 600 B.C. It was a more extensive and complete record of God’s dealings with his children than our present Bible. (1 Nephi 13:23.) It appears to be primarily a record kept by those who descended from Joseph, and also a record of prophets of the tribe of Joseph (see 3 Nephi 10:16). This verse attests that all the holy prophets have testified of sacred truths common to all generations.

Doctrinal Commentary on the Book of Mormon, Vol. 1

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