1 Nephi 19:21

And he surely did show unto the prophets of old all things concerning them;

and also he did show unto many concerning us;

wherefore, it must needs be that we know concerning them

for they are written upon the plates of brass.

wherefore, it must needs be that we know concerning them

wherefore - 29 occurrences in 27 verses - 1 Nephi 16:2, 23,   17:3, 13, 15, 19, 22, 25, 40, 44, 45, 55,   18:2, 3, 4, 6, 10, 13, 15, 20, 24,   19:1, 2, 4, 9, 19, 21

wherefore it - 2 occurrences in 2 verses - 1 Nephi 18:2,   19:21