Exodus 7:1-8

1 The LORD answered Moses, "I have made you a god to Pharaoh, and your brother Aaron is your prophet.
2 Tell your brother Aaron everything I command you, and he must tell Pharaoh to let the Israelites leave the country.
3 But I will make Pharaoh stubborn. Even though I will do many miraculous signs and amazing things in Egypt,
4 Pharaoh will not listen to you. Then I will use my power to punish Egypt severely, and I will bring my people, the Israelites, out of Egypt in organized family groups.
5 The Egyptians will know that I am the LORD when I use my power against Egypt and bring the Israelites out of there."
6 Moses and Aaron did as the LORD had commanded them.
7 Moses was 80 years old and Aaron was 83 when they talked to Pharaoh.
8 The LORD said to Moses and Aaron,