Exodus 7:9-10
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9“When Pharaoh speaks to you, saying, ‘Work a miracle,’ then you shall say to Aaron, ‘Take your staff and throw it down before Pharaoh, so that it may turn into a serpent.’ ” 10So Moses and Aaron came to Pharaoh, and so they did, just as the Lord had commanded; and Aaron threw his staff down before Pharaoh and his servants, and it turned into a serpent.