1 Nephi 13:20
20 And it came to pass that I, Nephi, beheld that they did
prosper in the land; and I beheld a book, and it was carried
forth among them.

1 Nephi 13:21
21 And the angel said unto me: Knowest thou the meaning of the
book?

1 Nephi 13:22
22 And I said unto him: I know not.

1 Nephi 13:23
23 And he said: Behold it proceedeth out of the mouth of a Jew.
And I, Nephi, beheld it; and he said unto me: The book that thou
beholdest is a record of the Jews, which contains the covenants
of the Lord, which he hath made unto the house of Israel; and it
also containeth many of the prophecies of the holy prophets; and
it is a record like unto the engravings which are upon the plates
of brass, save there are not so many; nevertheless, they contain
the covenants of the Lord, which he hath made unto the house of
Israel; wherefore, they are of great worth unto the Gentiles.

1 Nephi 13:24
24 And the angel of the Lord said unto me: Thou hast beheld that
the book proceeded forth from the mouth of a Jew; and when it
proceeded forth from the mouth of a Jew it contained the fulness
of the gospel of the Lord, of whom the twelve apostles bear
record; and they bear record according to the truth which is in
the Lamb of God.