The Rod Represents The Priesthood
The rod that turned to a serpent on the Mountain acts as a symbol of the true priesthood. The demonstration in front of Pharaoh with the serpents is yet another display of the true priesthood vs the imitation priesthood of the world. This theme is carried through the plagues. The "magicians" (Egyptian priests) cannot reverse the plagues with their priesthood. The "Passover" foreshadows the atoning sacrifice of Jesus Christ and the Sacrament.
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