There are two things that traditionally only happened to the king. One occurred at the coronation when traditionally the king would hear God saying, "Thou art my Son; this day have I begotten thee." (Psalm 2:7). The king became a son of God representing God as his viceroy here on earth, the link between God and the people. However, in Mosiah 5:7, Benjamin declared that through the covenant, the people had all become sons and daughters of Christ. These people were in transition. They were living the Law of Moses, and they were expecting the fulfillment of the prophecies of Christ. In Benjamin’s speech we see what is missing in the Old Testament. We have the Old Testament and the New Testament, but we do not have anything showing how they went from one to the other. Benjamin’s speech is exactly halfway between the old law and the new law, and it begins with every single person being able to make the same covenant that was previously made only by the king. They are all sons and daughters of God. They get the name; they get the blessings and promises of the covenant.
Matthew L. Bowen, "Becoming Sons and Daughters at God’s Right Hand: King Benjamin’s Rhetorical Wordplay on His Own Name," Journal of the Book of Mormon and Other Restoration Scripture 21, no. 2 (2012): 2–13.
Figure 4 John W. Welch and Greg Welch, "Benjamin and the Law of the King," in Charting the Book of Mormon, chart 125.