3 Nephi 16:7

Behold, because of their belief in me, saith the Father, and because of the unbelief of you, O house of Israel, in the latter day shall the truth come unto the Gentiles, that the fulness of these things shall be made known unto them.

Because they believe in me, the Father says the truth will come to the non-Jewish people in the last days. This is because you, people of Israel, do not believe. The non-Jewish people will learn all these things.

Because of their belief in me, says the Father—and because of your unbelief, house of Israel—in the last days the truth will go to the Gentiles first. Everything will be made known to them.