Exodus 5:10

5:10 So the slave masters of the people and their foremen went to the Israelites and said, “Thus says Pharaoh: ‘I am not giving you straw.

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 8:1

8:1 (7:26) Then the Lord said to Moses, “Go to Pharaoh and tell him, ‘Thus says the Lord: “Release my people in order that they may serve me!