The second epistle of Mormon to his son Moroni.
Both the Nephites and the Lamanites are depraved and degenerate—They torture and murder each other—Mormon prays that grace and goodness may rest upon Moroni forever. About A.D. 401.
Read Moroni 9 here: https://www.churchofjesuschrist.org/study/scriptures/bofm/moro/9?lang=eng