Exodus 7:9

7:9 “When Pharaoh says to you, ‘Do a miracle,’ and you say to Aaron, ‘Take your staff and throw it down before Pharaoh,’ it will become a snake.”

Exodus 8:12

8:12 Then Moses and Aaron went out from Pharaoh, and Moses cried to the Lord because of the frogs that he had brought on Pharaoh.

Exodus 11:10

11:10 So Moses and Aaron did all these wonders before Pharaoh, but the Lord hardened Pharaoh’s heart, and he did not release the Israelites from his land.