Alma 37:1-5; refer in this text to 1 Ne. 3:3,12
“Since many of the precious truths of the brass plates were known and recorded by Book of Mormon prophet-writers, and since the Book of Mormon will eventually go to all the world as a witness of Jesus Christ and also of the great latter-day work, this particular prophetic utterance is being and will yet be fulfilled. In addition, undoubtedly at some future day the brass plates themselves will be brought forth and their contents thereafter will be available for study to all those with pure hearts and with ears to hear.” (R. Millet and J. F. McConkie, Doctrinal Commentary on the Book of Mormon, 1:50)