4 Nephi 48

And it came to pass that when three hundred and twenty years had passed away, Ammaron, being constrained by the Holy Ghost, did hide up the records which were sacred— yea, even all the sacred records which had been handed down from generation to generation, which were sacred—even until the three hundred and twentieth year from the coming of Christ.

From section: Ammaron and the Nephite Records

From page: Nephite Decline and Downfall

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