Exodus 7:3-5

7:3 But I will harden Pharaoh’s heart, and although I will multiply my signs and my wonders in the land of Egypt, 7:4 Pharaoh will not listen to you. I will reach into Egypt and bring out my regiments, my people the Israelites, from the land of Egypt with great acts of judgment. 7:5 Then the Egyptians will know that I am the Lord, when I extend my hand over Egypt and bring the Israelites out from among them.