It is interesting to see where they are coming from. Of the 12 occurences in the Book of Mormon, 11 come from Alma-2. We know Alma's story and his dramatic conversion. With such an experience, the concept of being "born again" is probably more prevalent for him compared to someone who experiences this more gradually like many of the other Book of Mormon voices (presumably), Nephi, Jacob, Mormon and Moroni. Right after his experience with the angel, Alma says in Mosiah 27:25:
And the Lord said unto me: Marvel not that all mankind, yea, men and women, all nations, kindreds, tongues and people, must be ; yea, , from their carnal and state, to a state of righteousness, being redeemed of God, becoming his and daughtersThis becomes a common theme in his preaching: Alma 36:5, Alma 5:14, Alma 5:49, Alma 7:14 and Alma 38:6 are examples.
So what about the one use of the phrase "born again" or "born of God" that does not come from Alma? It's found in Alma 22:15 when the Lamanite king asks: "What shall I do that I may be