Exodus 7:1-4

1Then the Lord said to Moses, “Now hear this: I make you as God to Pharaoh [to declare My will and purpose to him]; and your brother Aaron shall be your prophet.

2You shall speak all that I command you, and your brother Aaron shall tell Pharaoh to let the children of Israel go out of his land.

3And I will make Pharaoh’s heart hard, and multiply My signs and My wonders (miracles) in the land of Egypt.

4But Pharaoh will not listen to you, and I shall lay My hand on Egypt and bring out My hosts [like a defensive army, tribe by tribe], My people the children of Israel, out of the land of Egypt by great acts of judgment (the plagues).