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Aaron spoke for Moses, when he went to tell Pharaoh the King of Egypt everything God wanted Moses to say. The Lord said to Moses (Exodus 7:1 to 3), "See, I have made you like God to Pharaoh, and your brother Aaron will be your prophet. You are to say everything I command you, and your brother Aaron is to tell Pharaoh to let the Israelites go out of his country...".
Aaron's staff was used by the Lord a few times when trying to persuade the Pharaoh to let the Israelites go. The Lord ordered Moses and Aaron, "When Pharaoh says to you, 'Perform a miracle,' then say to Aaron, Take your staff and throw it down before Pharaoh', and it will become a snake." So Moses and Aaron went to Pharaoh and Aaron did so. Aaron's staff, according to the Bible, really became a snake and ate up all the other snakes that the Pharaoh's magicians had made. Also, Aaron's staff was used to make the Nile River all turn into blood. He "stretched it out", and the fish in the Nile died, and the river smelled; and the Egyptians could not drink the water, as it was recorded in the Bible.