As Nephi was taught, so did Benjamin make sure his three sons were taught in all the language of his fathers. This included the reformed Egyptian used among the Nephites. How else could his son, Mosiah, continue the record, teach the scriptures to the people, and pass on this special language?
Neal A. Maxwell
"King Benjamin's tutorial efforts not only included encouraging his sons, but also teaching them in the language of his fathers, as well as how to appreciate and search sacred records. And many more things did king Benjamin teach his sons, which are not written in this book (v. 8)—many more things—intriguing to think about, isn't it?
"In contrast to Benjamin's effective fatherhood, one cannot help but remember Eli whose sons knew not the Lord and in their iniquity, Eli restrained them not (1 Sam 3:13). With no desire to be judgmental whatsoever, one ponders those comparative implications." (Farms Symposia Audiotape, "Benjamin's Sermon: A Manual for Discipleship")