The brother of Jared saw a marvelous revelation and wrote about it, but we don't have those words (yet).
4 Behold, I have written upon these plates the very things which the brother of Jared saw; and there never were greater things made manifest than those which were made manifest unto the brother of Jared.
In telling us about his experience, Moroni mentions that King Mosiah "kept them" according to the commandment of the Lord. In Mosiah 8, we read about the people who first discovered these records:
8 And they were lost in the wilderness for the space of many days, yet they were diligent, and found not the land of Zarahemla but returned to this land, having traveled in a land among many waters, having discovered a land which was covered with bones of men, and of beasts, and was also covered with ruins of buildings of every kind, having discovered a land which had been peopled with a people who were as numerous as the hosts of Israel.
9 And for a testimony that the things that they had said are true they have brought twenty-four plates which are filled with engravings, and they are of pure gold.
Note the reference to "
bones". In Mosiah 28, we read about Mosiah translating the records:
11 Therefore he took the records which were engraven on the plates of brass, and also the plates of Nephi, and all the things which he had kept and preserved according to the commandments of God, after having translated and caused to be written the records which were on the plates of gold which had been found by the people of Limhi, which were delivered to him by the hand of Limhi;
In addition, we get an
editorial promise to hear more about the Jaredites in verse 19:
19 And this account shall be written hereafter; for behold, it is expedient that all people should know the things which are written in this account.