1 Nephi 21:6

And he said:

It is a light thing

that thou shouldst be my servant

to raise up the tribes of Jacob,

and to restore the preserved of Israel.

I will also give thee for a light to the Gentiles,

that thou mayest be my salvation unto the ends of the earth.

I will also give thee for a light to the Gentiles,

for - 27 occurrences in 20 verses - 1 Nephi 19:23, 24,   20:5, 8, 9, 10, 11, 12, 21,   21:4, 6, 8, 10, 13, 15, 19, 20, 23, 24, 25

for a - 2 occurrences in 2 verses - 1 Nephi 21:6, 8