Book of Mormon, Chapter One. Book of Mormon 1830 First Edition.

Mormon writes that Ammaron who hid up the records, spoke to 10 year old Mormon and told him about the plates hidden up in a hill called Shim in the land Antum, and that when he turned 24, he was to take the plates of Nephi and write upon them the things of the people. He was told to leave the rest of the plates where they were. Mormon writes that when he was 16 he was chosen to be leader of armies and continued to lead the Nephites in battle to protect against the Lamanites but thar eventually he gave up leading them as they delighted in wickedness and were not repentent, and miracles stopped amongst them and the Holy Ghost withdrew and also the three disciples went out of the land. Mormon says that he was visited of the Lord. At age 15 he tried to preach to the people but he was forbidden by the voice of the Lord, but later on he was given to preach repentence to the people but they did not listen.