3 Nephi 5:14–15

And it hath become expedient that I, according to the will of God, that the prayers of those who have gone hence, who were the holy ones, should be fulfilled according to their faith, should make a record of these things which have been done—Yea, a small record of that which hath taken place from the time that Lehi left Jerusalem, even down until the present time.

From section: Mormon’s Editorial About his Work and Calling

From page: Mormon Abridges the Nephite Records

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