Alma - 37
Discussion related to this chapter in the Book of Mormon
The plates of brass and other scriptures are preserved to bring souls to salvation. The Jaredites were destroyed because of their wickedness. Their secret oaths and covenants must be kept from the people. Counsel with the Lord in all thy doings. As the Liahona guided the Nephites, so the word of Christ leads men to eternal life. About 73 B.C.
Source: LDS Scriptures