Exodus 7:2-12 MSG

2 You are to speak everything I command you, and your brother Aaron will tell it to Pharaoh. Then he will release the Israelites from his land.
3 At the same time I am going to put Pharaoh's back up and follow it up by filling Egypt with signs and wonders.
4 Pharaoh is not going to listen to you, but I will have my way against Egypt and bring out my soldiers, my people the Israelites, from Egypt by mighty acts of judgment.
5 The Egyptians will realize that I am God when I step in and take the Israelites out of their country."
6 Moses and Aaron did exactly what God commanded.
7 Moses was eighty and Aaron eighty-three when they spoke to Pharaoh.
8 Then God spoke to Moses and Aaron. He said,
9 "When Pharaoh speaks to you and says, 'Prove yourselves. Perform a miracle,' then tell Aaron, 'Take your staff and throw it down in front of Pharaoh: It will turn into a snake.'"
10 Moses and Aaron went to Pharaoh and did what God commanded. Aaron threw his staff down in front of Pharaoh and his servants, and it turned into a snake.
11 Pharaoh called in his wise men and sorcerers. The magicians of Egypt did the same thing by their incantations:
12 each man threw down his staff and they all turned into snakes. But then Aaron's staff swallowed their staffs.