Exodus 7:8-13 NRS

8 The Lord said to Moses and Aaron,
9 "When Pharaoh says to you, "Perform a wonder,' then you shall say to Aaron, "Take your staff and throw it down before Pharaoh, and it will become a snake.' "
10 So Moses and Aaron went to Pharaoh and did as the Lord had commanded; Aaron threw down his staff before Pharaoh and his officials, and it became a snake.
11 Then Pharaoh summoned the wise men and the sorcerers; and they also, the magicians of Egypt, did the same by their secret arts.
12 Each one threw down his staff, and they became snakes; but Aaron's staff swallowed up theirs.
13 Still Pharaoh's heart was hardened, and he would not listen to them, as the Lord had said.