For the source text click/tap here: Zevachim 102
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When Moshe is reluctant to accept the responsibilities of leadership, refusing God’s repeated requests that he return to Egypt as leader of the Children of Israel (see Sefer Shemot Chapters 3 and 4), God ultimately becomes angry with Moshe and tells him that his brother Aharon the Levite will speak on his behalf (Shemot 4:14).
Rabbi Shimon bar Yoḥai interprets this passage to mean that God had originally planned to make Moshe the priest and leave Aharon as a levi. Since Moshe refused to accept responsibility as a leader, God was going to switch their positions so that Aharon became the kohen and Moshe remained a Levi.
We review various commentaries on the relative roles of Moshe and Aharon.