1 Nephi 3:5-7

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.

1 Nephi 2:12

12. And thus Laman and Lemuel, being the eldest, did murmer against their father. And they did murmer because they knew not the dealings of that God who had created them.