Exodus 7:1-7 NIV

[1] Then the LORD said to Moses, “See, I have made you like God to Pharaoh, and your brother Aaron will be your prophet. [2] You are to say everything I command you, and your brother Aaron is to tell Pharaoh to let the Israelites go out of his country. [3] But I will harden Pharaoh’s heart, and though I multiply my signs and wonders in Egypt, [4] he 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. [5] And the Egyptians will know that I am the Lord when I stretch out my hand against Egypt and bring the Israelites out of it.” [6] Moses and Aaron did just as the LORD commanded them. [7] Moses was eighty years old and Aaron eighty-three when they spoke to Pharaoh.