1 Nephi 20:4

And I did it because I knew that thou art obstinate,

and thy neck is an iron sinew, and thy brow brass;

And I did it because I knew that thou art obstinate,

it - 8 occurrences in 7 verses - 1 Nephi 19:22, 23,   20:4, 5, 16, 17,   21:6