Exodus 7:2-4

2You are to say everything I command you, and your brother Aaron is to tell Pharaoh to let the Israelites go out of his country. 3But I will harden Pharaoh’s heart, and though I multiply my signs and wonders in Egypt, 4he will not listen to you. Then I will lay my hand on Egypt and with mighty acts of judgment I will bring out my divisions, my people the Israelites.