1 Nephi 10:15

And after this manner of language did my father prophesy

and speak unto my brethren,

and also many more things which I do not write in this book;

for I have written as many of them as were expedient for me in mine other book.

for I have written as many of them as were expedient for me in mine other book.

for - 32 occurrences in 28 verses - 1 Nephi 10:2, 8, 15, 18, 19, 20,   11:1, 6, 7, 11, 12, 19, 33, 34,   12:9, 10,   13:9, 15, 26, 30, 35, 37, 41,   14:3, 4, 7, 17, 25

for I - 3 occurrences in 2 verses - 1 Nephi 10:15,   11:11