The anger of the Lord. The expression used is strong but probably means no more than that God was displeased. He did not punish Moses otherwise than by dividing between the two men the responsibility Moses was to have had alone.
Aaron the Levite. It is not clear why God here spoke of Aaron as “the Levite.” Some have suggested that there were others by the same name among the Israelites and that this designation was necessary to distinguish him. But it is not clear why the words “thy brother” would not have been sufficient in this case. Others have thought the designation anticipates the future consecration of his tribe to God’s special service.
He cometh forth. It has been suggested that Aaron planned to visit Moses in Midian to inform him of the death of the king from whom he had fled (see Exodus 2:15, 23). Under any circumstances, Aaron did not start on his journey until God instructed him to go (Exodus 4:27).