Exodus 4:30
30 Aaron spoke all the words that the Lord had spoken to Moses and did the signs in the sight of the people.
Exodus 7:1–2
Moses and Aaron Before Pharaoh
1 tAnd the Lord said to Moses, “See, uI have made you like God to Pharaoh, and your brother Aaron shall be your prophet. 2 You shall speak all that I command you, and your brother Aaron shall tell Pharaoh to let the people of Israel go out of his land.