There’s a curious series of events that happen when Moshe and Aaron appear before Pharaoh and begin to display the signs and wonders of Hashem to him and his court. The first thing they do is provide him a sign of their authority from Hashem by turning Aaron’s staff into a serpent. However, Pharaoh’s magicians also turn their staffs into serpents as well. And after Hashem turns the water of Egypt into blood, the magicians of Egypt replicate this miracle as well. It says, “But the magicians of Egypt did the same by their secret arts” (Exodus 7:22).