THEOSISAugustine of Hippo
A pertinent inquiry emerges as to why the Lord expressed frustration regarding Moses' brother, suggesting that he would communicate on behalf of Moses. The reason lies in Moses’ hesitance; thus, the Lord did not bestow upon him the full extent of His intended abilities, preferring instead that two should accomplish what could be achieved by a single person who possessed faith. However, a closer inspection of these statements reveals that the Lord’s anger did not result in the provision of Aaron as a punishment. The Lord states: "Have you not Aaron a brother, a Levite? I know that he can speak." This indicates that the Lord was admonishing Moses for his reluctance, even though he had a brother who could convey His message to the people, despite Moses' self-perceived inadequacies.
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Following this, the Lord reaffirms His earlier promise before expressing displeasure; He had previously declared: “I will open your mouth and teach you,” but now proclaims: “I will open your mouth and his mouth and teach you what ye shall do.” Although the Lord added, “And he shall speak in your stead to the people” (Ex. 4:16), it suggests that Moses’ mouth had already been opened, given that he claimed to be eloquent. In response to Moses' perceived vocal weakness, the Lord chose not to assist him directly, instead providing a brother who could effectively teach the people. The directive, “Thou shalt put words into his mouth,” implies that these words are meant to be articulated; had they merely been for the audience's hearing, the Lord would have said “into their ears.” Subsequently, He confirms: “He shall speak in your place to the people, and shall himself be your mouth,” emphasizing the phrase “to the people.” When He notes, “He shall speak in thy stead to the people,” it clearly establishes Moses’ primary role and Aaron's subordinate position. Furthermore, when He states, “And thou shalt be to him in God's stead,” it suggests a profound truth to explore: Moses acts as the mediator between God and Aaron, while Aaron serves as the mediator between Moses and the people.