What is the order of the message from God to Israel in Exodus 4?
God spoke to Moses; Moses gave direction; Aaron served as mouthpiece and spoke all the words the Lord had spoken to Moses to the gathered elders of Israel. Then the accompanying act followed. So the order is God, Moses, Aaron, Israel.
Les explains that Moses and Aaron were brought together after Moses objected he could not speak; God, in His anger, appointed Aaron as Moses' mouthpiece. They were brothers, so Aaron became the spokesman, while Moses was the one through whom God spoke and gave direction. In Exodus 4:29, Moses and Aaron went to the children of Israel in Goshen and gathered all the elders. Aaron then spoke all the words the Lord had spoken unto Moses, and the account moves to the next action ('and did the...'). This shows the order: God to Moses, Moses to Aaron, Aaron to the elders of Israel.
And Moses and Aaron went and gathered together all the elders of the children of Israel: