"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."
Laman and Lemuel, being their usual selves, complain and grown about the task. They still are under the impression it's Lehi telling them to do the things commanded. When in fact it is the Lord, god who tell them to do these things. Lehi recognized the importance of keeping the commandments of the Lord and so by doing was blessed to continue to receive revelations.
Laman, Lemuel themself same stubborn, complain about #Job. them believe Lehi himself command, not God. Lehi understand keep commandments need. For-for? blessing receive can. Revelation continue can.