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.
and also many more things which I do not write in this book;
this - 15 occurrences in 12 verses - 1 Nephi 10:5, 6, 8, 15, 11:7, 12:18, 13:6, 8, 27, 34, 14:4, 24