Exodus 7:5-6

7:5 Then the Egyptians will know that I am the Lord, when I extend my hand over Egypt and bring the Israelites out from among them.

7:6 And Moses and Aaron did so; they did just as the Lord commanded them.

Exodus 7:12

7:12 Each man threw down his staff, and the staffs became snakes. But Aaron’s staff swallowed up their staffs.