Behold, I say unto you, that the house of Israel was compared unto an olive tree, by the Spirit of the Lord which was in our father; and behold are we not broken off from the house of Israel, and are we not a branch of the house of Israel?
And now, the thing which our father meaneth concerning the grafting in of the natural branches through the fulness of the Gentiles, is, that in the latter days, when our seed shall have dwindled in unbelief, yea, for the space of many years, and many generations after the Messiah shall be manifested in body unto the children of men, then shall the fulness of the gospel of the Messiah come unto the Gentiles, and from the Gentiles unto the remnant of our seed—
And at that day shall the remnant of our seed know that they are of the house of Israel, and that they are the covenant people of the Lord; and then shall they know and come to the knowledge of their forefathers, and also to the knowledge of the gospel of their Redeemer, which was ministered unto their fathers by him; wherefore, they shall come to the knowledge of their Redeemer and the very points of his doctrine, that they may know how to come unto him and be saved. 1 Nephi 15:12-14

Nephi's vision in Chapter 15 claimed:

• After faith has dwindled...
• After the space of many years...
• Many generations sfter the Messiah manifested himself...
• Then the fulness of the Gospel of the Messiah will come to the Gentiles.

And this is what our father meaneth; and he meaneth that it will not come to pass until after they are scattered by the Gentiles; and he meaneth that it shall come by way of the Gentiles, that the Lord may show his power unto the Gentiles, for the very cause that he shall be rejected of the Jews, or of the house of Israel. 1 Nephi 15:17

This will happen when they are scattered by the Gentiles and it will come by way of the Gentiles.

Two problems with this prophecy:

1. It borrows terminology written by Paul in 60 BC from the book of Romans, chapter 11, about grafting in of other people.
2. It means that everyone who saw Jesus did not receive the fulness of the Gospel.  Were they saved and everyone after them?  If the fulness did not occur for MANY GENERATIONS after Jesus manifested himself, then were all his followers sent to hell?  What happened to all the people from 30 AD to 1860 AD when Joseph Smith uncovered the true Gospel?