1 Nephi 6

1 And now I, Nephi, do not give the genealogy of my fathers in this part of my record; neither at any time shall I give it after upon these plates which I am writing; for it is given in the record which has been kept by my father; wherefore I do not write it in this work.
2 For it sufficeth me to say, that we are a descendant of Joseph.
3 And it mattereth not to me that I am particular to give a full account of all things of my father, for they cannot be written upon these plates, for I desire the room, that I may write of the things of God.
4 For the fullness of mine intent is that I may persuade men to come unto the God of Abraham, and the God of Isaac, and the God of Jacob, and be saved.
5 Wherefore the things which are pleasing unto the world, I do not write, but the things which are pleasing unto God and unto them which are not of the world.
6 Wherefore I shall give commandment unto my seed, that they shall not occupy these plates with things which are not of worth unto the children of men.