1 Nephi 5: Nephi, Laman, Lemuel and Zoram return to Lehi with the Brass Plates
Upon returning to Sariah and Lehi in the wilderness, Sariah [the mother] was filled with joy; “For she had supposed that we had perished in the wilderness; and she also had complained against my father, telling him that he was a visionary man; saying: Behold thou hast led us forth from the land of our inheritance, and my sons are no more, and we perish in the wilderness.” (1 Nephi 5:2)
However, Lehi [the father] comforted her in the wilderness while they were away, saying; “…I know that I am a visionary man; for if I had not seen the things of God in a vision I should not have known the goodness of God, but had tarried at Jerusalem, and had perished with my brethren.” (1 Nephi 5:4)
After seeing her sons returned safely to her in the wilderness, Sariah exclaimed; “…Now I know of a surety that the Lord hath commanded my husband to flee into the wilderness; yea, and I also know of a surety that the Lord hath protected my sons, and delivered them out of the hands of Laban, and given them power whereby they could accomplish the thing which the Lord hath commanded them…” (1 Nephi 5:8) Sariah was overwhelmed with joy and filled with the Spirit of the Lord, because she now believed that Lehi was a prophet of God.
They all rejoiced and offered sacrifices unto the Lord, they then searched through the plates to find; “…that they did contain the five books of Moses, which gave an account of the creation of the world, and also of Adam and Eve, who were our first parents; And also a record of the Jews from the beginning, even down to the commencement of the reign of Zedekiah, king of Judah;” (1 Nephi 5:11-13) Nephi and his family now had the first five books of the Bible that we know today, they would be blessed with this information in their day of prophets that had lived before them, as we are blessed by the Book of Mormon and Bible today in modern times.
Lehi learns that his geneology goes back to Joseph, who was the son of Jacob who was the very same Joseph who was sold into Egypt (See Genesis 37) “…Lehi, also found upon the plates of brass a genealogy of his fathers; wherefore he knew that he was a descendant of Joseph; yea, even that Joseph who was the son of Jacob, who was sold into Egypt, and who was preserved by the hand of the Lord, that he might preserve his father, Jacob, and all his household from perishing with famine.” (1 Nephi 5:14)
They also discover that Laban was a descendant of Joseph, wherefore he and his fathers had kept the records. Lehi was filled with the Spirit and began to prophecy exclaiming that these plates of brass would go forth among all nations, and tongues!
Nephi explains that they; “…had obtained the records which the Lord had commanded us, and searched them and found that they were desirable; yea, even of great worth unto us, insomuch that we could preserve the commandments of the Lord unto our children. Wherefore, it was wisdom in the Lord that we should carry them with us, as we journeyed in the wilderness towards the land of promise.” (1 Nephi 4:21-22)