Exodus 7:1

So the LORD said to Moses: "See, I have made you as God to Pharaoh, and Aaron your brother shall be your prophet.

Surrounding context

7:1 So the LORD said to Moses: "See, I have made you as God to Pharaoh, and Aaron your brother shall be your prophet.

7:2 You shall speak all that I command you. And Aaron your brother shall tell Pharaoh to send the children of Israel out of his land.