Exodus 7:1-7

1Then the Lord said to Moses, ‘Look, I have made you like God to Pharaoh. Your brother Aaron will speak on your behalf, like your prophet.

2You must say everything that I command you to say. Your brother Aaron must tell Pharaoh to let the Israelites go out of his country.

3But I will make Pharaoh's mind become hard. I will do many miracles in Egypt that show my power.

4But Pharaoh will still refuse to listen to you. Then I will show my authority and I will punish the Egyptians. I will bring my people, the Israelites, out of Egypt like an army.

5Then the Egyptians will know that I am the Lord. I will show my great strength in Egypt and I will lead the Israelites out from there.’

6Moses and Aaron obeyed all the commands of the Lord.

7Moses was 80 years old and Aaron was 83 years old when they spoke to Pharaoh.