EXO 7:10

10 And so Moses and Aaron entered to Pharaoh, and did as the Lord commanded; and Aaron took the rod, and cast forth it before Pharaoh and his servants, the which rod was turned into a serpent. (And so Moses and Aaron came before Pharaoh, and did as the Lord commanded; and Aaron took his staff, and threw it down before Pharaoh and his servants, and the staff was turned into a serpent.)