Alma had commanded that certain parts of the scriptural record be kept secret. These included the oaths, covenants, and plans of the secret combinations (Alma 37:27-29), the revelation of Alma which foretells the destruction of the entire Nephite nation (Alma 45:9-14), and the revelation given to the brother of Jared (Ether 3:25-4:7).
Joseph Fielding Smith
"The people of Limhi brought to Mosiah a record, '... engraven on plates of ore,' ("Mosiah 21:27Mosiah 21:27) which record Mosiah translated by the aid of 'two stones which were fastened into the two rims of a bow,' and which gave an account of the Jaredites. (See Ibid., "Mosiah 28:11"Mosiah 28:12"Mosiah 28:13"Mosiah 28:14"Mosiah 28:15"Mosiah 28:16"Mosiah 28:17"Mosiah 28:18"Mosiah 28:1928:11-19.) In translating this record Mosiah kept from going forth to the people that particular part forbidden of the Lord to be revealed until after he was lifted up upon the cross. (See "Ether 4:1Ether 4:1.) These sacred revelations given to the brother of Jared were kept from the Nephite people, as well as many other things, until after the resurrection of Christ. (See "Alma 63:12Alma 63:12.) After the appearing of the Savior to the Nephites, the vision of the brother of Jared was revealed to the Nephites." ("Your Question by Joseph Fielding Smith," Improvement Era, June, 1954)