Lehi tells Nephi that he and his brothers need to return to Jerusalem to obtain sacred records (family genealogies and scriptures) from Laban. Though the task seems impossible, Nephi responds with heroic faith, while Laman and Lemuel complain.
Based on 1 Nephi 3:1–8:
1 And it came to pass that I, Nephi, returned from speaking with the Lord, to the tent of my father.
2 And it came to pass that he spake unto me, saying: Behold I have dreamed a dream, in the which the Lord hath commanded me that thou and thy brethren shall return to Jerusalem.
3 For behold, Laban hath the record of the Jews and also a genealogy of my forefathers, and they are engraven upon plates of brass.
4 Wherefore, the Lord hath commanded me that thou and thy brothers should go unto the house of Laban, and seek the records, and bring them down hither into the wilderness.
5 And now, behold thy brothers murmur, saying it is a hard thing which I have required of them; but behold I have not required it of them, but it is a commandment of the Lord.
6 Therefore go, my son, and thou shalt be favored of the Lord, because thou hast not murmured.
7 And it came to pass that I, Nephi, said unto my father: I will go and do the things which the Lord hath commanded, for I know that the Lord giveth no commandments unto the children of men, save he shall prepare a way for them that they may accomplish the thing which he commandeth them.
8 And it came to pass that when my father had heard these words he was exceedingly glad, for he knew that I had been blessed of the Lord.
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The Book of Mormon: Another Testament of Jesus Christ
https://www.churchofjesuschrist.org/study/scriptures/bofm/1-ne/3.1-8?lang=eng#p1
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