Enos was third in the series of record keepers who maintained the record of the Nephites, a set of metal plates containing the spiritual and secular history of the Nephites. Enos was given charge of the record by his father, Jacob, son of Lehi and brother of Nephi. Both Nephi and Jacob had kept the record previously, recording First and Second Nephi and the Book of Jacob, respectively. Enos's contribution to the record, the Book of Enos, consists of a single chapter, told in the first person, describing his own conversion and subsequent ministry.
Following Enos's death the record of the Nephites was kept by Enos' son, Jarom.
No details of Enos's early life are given except that he had been taught by his father "in the nurture and the admonition of the Lord. Because Enos begins his story by telling of his "wrestle which [he] had before God, before [he] received a remission of [his] sins, it is sometimes assumed that he had been rebellious prior to that time, though this is not explicitly stated and is perhaps contraindicated by his father entrusting him with the record.
Enos relates that, while hunting wild beasts in the forest, his "soul hungered and he knelt and prayed for forgiveness. His prayer continued throughout the day and into the night, until he heard a voice, saying: "Enos, thy sins are forgiven thee, and thou shalt be blessed.
Having obtained personal forgiveness, Enos continued to pray on behalf of his people, the Nephites, and was given to understand that they would be blessed "according to their diligence in keeping [God's] commandments. His faith being strengthened by these revelations, he began to pray for "[his] brethren, the Lamanites, who have become estranged from the Nephites and are now their enemies. He received a promise that the record of the Nephites would be preserved and would be brought forth to the Lamanites in the Lord's "due time.
Following this powerful conversion, Enos went forth prophesying to the Nephites. He testifies that the Nephites tried to "restore the Lamanites to the true faith in God, but that they were unsuccessful. He describes the Lamanites as having become "wild, and ferocious, and a blood-thirsty people. The Nephites, in contrast, are industrious at farming and herding, but Enos makes it clear that they were "stiffnecked" and continual preaching of the word of God was necessary to keep them from "going down speedily to destruction.
At the close of his record, Enos testifies of his unshakeable faith in his Redeemer.