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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He said, "Pharaoh will say to you, 'Do a miracle.' When he does, speak to Aaron. Tell him, 'Take your wooden staff and throw it down in front of Pharaoh.' It will turn into a snake."
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So Moses and Aaron went to Pharaoh. They did exactly as the LORD had commanded them. Aaron threw his staff down in front of Pharaoh and his officials. It turned into a snake.