3 Nephi 16
The clear message here is that lineage alone does not bring salvation. The children of Israel shall be trodden down and cast out inasmuch as they are full of unbelief – nevertheless the covenant shall be fulfilled and they shall not be forgotten, though they be deeply afflicted. The gentiles, if they repent and turn unto the lord shall be counted among the house of Israel but if they reject the gospel of Christ they shall be trodden down just as the children of Israel were for their unbelief.