Exodus 7:1-7

1And Jehovah said to Moses, See, I have made thee 1God to Pharaoh; and Aaron thy brother shall be thy prophet.

2Thou shalt speak all that I command thee; and Aaron thy brother shall speak unto Pharaoh, that he let the children of Israel go out of his land.

3And I will render Pharaoh's heart obdurate, and multiply my signs and my wonders in the land of Egypt.

4And Pharaoh will not hearken unto you; and I will lay my hand upon Egypt, and bring forth my hosts, my people, the children of Israel, out of the land of Egypt by great judgments.

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

6And Moses and Aaron did as Jehovah had commanded them: so did they.

7And Moses was eighty years old, and Aaron was eighty-three years old, when they spoke to Pharaoh.