Augustine of Hippo
The inquiry naturally arises as to why the Lord spoke with displeasure concerning Moses' brother, indicating that he would convey the message to the people on Moses' behalf. This reaction stems from Moses’ uncertainty; therefore, the Lord chose not to grant him the full capacity that He had originally intended, opting instead for two individuals to fulfill what one could accomplish if only he had faith. However, a closer examination reveals that the Lord’s words do not suggest that Aaron was given as a form of punishment due to divine anger. For the Lord asked, “Have you not Aaron your brother, a Levite?
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I know that he can speak.” This indicates that the Lord was actually chastising Moses for his unwillingness to go forth, despite having a brother who could articulate the intended message, even if Moses felt inadequate or inarticulate and required complete reliance on God.
The Lord recalls His prior promise and subsequently expresses displeasure. Initially, He stated, “I will open your mouth and teach you,” but now He proclaims, “I will open your mouth and his mouth and teach you what you shall do.” The phrase, “And he shall speak in your stead to the people” (Ex. 4:16), suggests that the ability to communicate was already bestowed upon Moses, as he claimed to be eloquent. In acknowledging his vocal limitations, the Lord chose not to intervene directly for Moses but provided him with a brother who was capable of addressing the people effectively. The directive to “put words into his mouth” indicates these were designated for proclamation; had they been meant solely for the people's hearing, the phrase would have been “into their ears.”
Later, He clarifies, “He shall speak in your place to the people, and shall himself be your mouth,” emphasizing the relationship with the people. When stating, “He shall speak in your stead to the people,” the Lord clearly establishes Moses' primary role and Aaron's subordinate position. Furthermore, when the Lord mentions, “And you shall be to him in God’s stead,” it hints at a profound mystery to be explored, illustrating that Moses serves as the mediator between God and Aaron, while Aaron acts as the intermediary between Moses and the people.