Exodus 4:14-15 So the anger of the LORD was kindled against Moses, and He said: "Is not Aaron the Levite your brother? I know that he can speak well. And look, he is also coming out to meet you. When he sees you, he will be glad in his heart. Now you shall speak to him and put the words in his mouth. And I will be with your mouth and with his mouth, and I will teach you what you shall do.
Exodus 7:1-2 So the LORD said to Moses: "See, I have made you asGod to Pharaoh, and Aaron your brother shall be your prophet. 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.
Exodus 7:6 Then Moses and Aaron did so; just as the LORD commanded them, so they did.
Exodus 7:19 Then the LORD spoke to Moses, "Say to Aaron, 'Take your rod and stretch out your hand over the waters of Egypt, over their streams, over their rivers, over their ponds, and over all their pools of water, that they may become blood. And there shall be blood throughout all the land of Egypt, both in buckets of wood and pitchers of stone.'"