if it so be that they harden their hearts against the Lamb of God.

their - 19 occurrences in 14 verses - 1 Nephi 10:3, 14,   12:10, 11,   13:15, 17, 30,   14:1, 2, 3, 6, 7, 12, 26

their hearts - 3 occurrences in 3 verses - 1 Nephi 14:2, 6, 7

their hearts against the Lamb of God - 2 occurrences in 2 verses - 1 Nephi 14:2, 6