Simultaneously, Moses and Elijah appeared next to Jesus, conversing about His coming departure, which He was destined to accomplish in Jerusalem (Lk 9:31). This conversation symbolized the profound mystery of the bodily exodus and the sufferings He would endure on the cross. Indeed, it is affirmed that the Law of Moses and the words of the holy prophets prefigured the mystery of Christ. The Law revealed this through images and shadows, presenting it as though on a canvas. The prophets declared beforehand in various manners that, at the appointed time, He would come in our likeness to bring salvation and life, willingly agreeing to die on the cross. Moses and Elijah, standing before Him and engaging in dialogue, represented the unity of the Law and the prophets with Christ. This illustrates that our Lord Jesus Christ encompasses the Law and the prophets as His foundation. It confirms that Christ reigns over the Law and the prophets, as foretold in their prophecies, which harmoniously align. The messages of the prophets are consistent with the teachings of the Law. I believe this is the very discussion that took place between Moses, the chief priest, and Elijah, the most esteemed of all prophets.