Exodus 7:2-5

2You shall speak all that I command you. And Aaron your brother shall tell Pharaoh to send the children of Israel out of his land.

3And I will harden Pharaoh’s heart, and multiply My signs and My wonders in the land of Egypt.

4But Pharaoh will not heed you, so that I may lay My hand on Egypt and bring My armies and My people, the children of Israel, out of the land of Egypt by great judgments.

5And the Egyptians shall know that I am the Lord, when I stretch out My hand on Egypt and bring out the children of Israel from among them.”