And the Lord spake unto Moses and unto Aaron After he had given them their commission, and instructions to go to Pharaoh, and a little before they went in to him:
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"When Pharaoh tells you: Perform a miracle, tell Aaron: Take your staff and throw it down before Pharaoh. It will become a serpent."
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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.