Exodus 7:3

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

2 Thou 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.

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

4 But 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.

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

6 And Moses and Aaron did so; as Jehovah commanded them, so did they.

7 And Moses was fourscore years old, and Aaron fourscore and three years old, when they spake unto Pharaoh.