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.

that thou shouldst be my servant

shouldst - 4 occurrences in 4 verses - 1 Nephi 20:5, 7, 17,   21:6