Moses said to Korah, “…Aaron, what is he that you should murmur against him?” Faced with the first challenge to his own leadership, Moses would have wanted all the support he could muster. Aaron was his elder brother and a natural source of succor and cover. Rabbi Hirsch points out that instead of allowing Aaron to “share the blame,” Moses is a true leader. He takes full responsibility for the situation and deflects the attention away from Aaron and onto himself.