Exodus 6:1

6:1 Then the Lord said to Moses, “Now you will see what I will do to Pharaoh, for compelled by my strong hand he will release them, and by my strong hand he will drive them out of his land.”

Exodus 8:21

8:21 If you do not release my people, then I am going to send swarms of flies on you and on your servants and on your people and in your houses. The houses of the Egyptians will be full of flies, and even the ground they stand on.

Exodus 14:12

14:12 Isn’t this what we told you in Egypt, ‘Leave us alone so that we can serve the Egyptians, because it is better for us to serve the Egyptians than to die in the desert!’”