V.1-9 Moses thinks of his own weakness instead of listening to what God has just said (in chapter 3). God in mercy does three things to show His power.
V.10-17 Instead of trusting the Lord, Moses continues his doubting and now loses part of his place of privilege. God uses two men to do one job. We should never doubt the power of God, nor think too much of ourselves.
V.24-26 Moses fails to obey and circumcise his boys, apparently because his wife didn’t want to. It almost cost Moses his life.
V.27-31 Notice how quickly Aaron obeys the Lord. Moses does all the miracles again.
V.31 Wonderful words — they believed, they heard. The last seven words give us the final result!