Exod 6:30-7:2

30But Moses said in the Lord's presence, “Since I am a poor speaker, why would Pharaoh listen to me?”Chapter 71The Lord said to Moses, “See, I have made you like God to Pharaoh, and your brother Aaron shall be your prophet.2You shall speak all that I command you, and your brother Aaron shall tell Pharaoh to let the Israelites go out of his land.