Nephi knew the scriptures. He knows and uses Isaiah very effectively. When we get to the story of the slaying of Laban, you will also see that it is heavily influenced by scriptural references and allusions, especially to Exodus 21:13–14. As readers, we can expect that when Nephi wrote something containing an allusion to his set of scriptures, he was making that textual connection intentionally. Nephi, like his father Lehi, was a record keeper and also a record reader. This explains why obtaining the brass plates was so crucial to Nephi in laying the religious, legal, and ethical foundations of his people.
Book of Mormon Central, "Why Is It Good to Seek Both Spiritual and Secular Learning? (1 Nephi 1:1)," KnoWhy 324 (June 9, 2017).