The eyewitnesses of Christ's majesty in II Peter 1:16 were Peter, James, and John, who were witnesses to the transfiguration, at which time God the Father transferred the central focus from the Law and the Prophets (symbolized by Moses and Elijah) onto His Son. Peter, James, and John, having experienced the majesty and power of this event, share their conviction and sure word of prophecy with those of us living today through their epistles near the conclusion of the Bible.