Exodus 4:1-9, 7:1-13
4 Moses answered, “What if they won’t believe me and will not obey me but say, ‘The Lord did not appear to you’?”
2 The Lord asked him, “What is that in your hand?”
“A staff,” he replied.
3 “Throw it on the ground,” he said. So Moses threw it on the ground, it became a snake, and he ran from it. 4 The Lord told Moses, “Stretch out your hand and grab it by the tail.” So he stretched out his hand and caught it, and it became a staff in his hand. 5 “This will take place,” he continued, “so that they will believe that the Lord, the God of their ancestors, the God of Abraham, the God of Isaac, and the God of Jacob, has appeared to you.”
6 In addition the Lord said to him, “Put your hand inside your cloak.” So he put his hand inside his cloak, and when he took it out, his hand was diseased, resembling snow. 7 “Put your hand back inside your cloak,” he said. So he put his hand back inside his cloak, and when he took it out, it had again become like the rest of his skin. 8 “If they will not believe you and will not respond to the evidence of the first sign, they may believe the evidence of the second sign. 9 And if they don’t believe even these two signs or listen to what you say, take some water from the Nile and pour it on the dry ground. The water you take from the Nile will become blood on the ground.”
7 The Lord answered Moses, “See, I have made you like God to Pharaoh, and Aaron your brother will be your prophet. 2 You must say whatever I command you; then Aaron your brother must declare it to Pharaoh so that he will let the Israelites go from his land. 3 But I will harden Pharaoh’s heart and multiply my signs and wonders in the land of Egypt. 4 Pharaoh will not listen to you, but I will put my hand into Egypt and bring the military divisions of my people the Israelites out of the land of Egypt by great acts of judgment. 5 The Egyptians will know that I am the Lord when I stretch out my hand against Egypt and bring out the Israelites from among them.”
6 So Moses and Aaron did this; they did just as the Lord commanded them. 7 Moses was eighty years old and Aaron eighty-three when they spoke to Pharaoh.
8 The Lord said to Moses and Aaron, 9 “When Pharaoh tells you, ‘Perform a miracle,’ tell Aaron, ‘Take your staff and throw it down before Pharaoh. It will become a serpent.’” 10 So Moses and Aaron went in to Pharaoh and did just as the Lord had commanded. Aaron threw down his staff before Pharaoh and his officials, and it became a serpent. 11 But then Pharaoh called the wise men and sorcerers—the magicians of Egypt, and they also did the same thing by their occult practices. 12 Each one threw down his staff, and it became a serpent. But Aaron’s staff swallowed their staffs. 13 However, Pharaoh’s heart was hard, and he did not listen to them, as the Lord had said.