1 Nephi 15

 Even in his young age, Nephi understood the gathering of Israel saying- 

"...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.

18 Wherefore, our father hath not spoken of our seed alone, but also of all the house of Israel, pointing to the covenant which should be fulfilled in the latter days; which covenant the Lord made to our father Abraham, saying: In thy seed shall all the kindreds of the earth be blessed."  (1 Nephi 15:17–18)

Another promise given to Abraham.