The hesitation regarding who will lead the Israelites and carry out the mission to Egypt reaches a practical resolution. Instead of repeating the command to go, God treats the journey as a finalized fact, simply outlining how the mission will unfold. A clear hierarchy of communication is established, setting up a system where inspiration and physical expression are divided between two leaders.
Moses serves as the ultimate source of authority and inspiration, while Aaron functions as the physical channel to the public. Aaron speaks on behalf of Moses, standing in his place to address the people. In fact, Moses never spoke directly to the Israelites; he communicated exclusively through Aaron, and later, after Aaron passed away, through his son Eleazar [אבן עזרא הקצר]. This arrangement was necessary because Moses's primary struggle lay in managing the people, a task that required endless explanation and persuasion. This contrasted sharply with his appearances before Pharaoh, where the Divine Presence spoke directly from Moses's throat without the need for a mediator [העמק דבר].
Aaron acts as the essential bridge. He takes the hidden thoughts residing in the heart and translates them into actual syllables and sound [ביאור יש"ר]. His task is to explain and clarify the deeper intent of the message [העמק דבר]. This role closely mirrors the ancient Egyptian title given to a senior official who mediated between the ruler and his subjects [קאסוטו]. Aaron does not invent the message from his own mind; rather, he serves purely as a vessel bringing Moses's words to light [ביאור שטיינזלץ].
In relation to Aaron, Moses takes on the role of a master, judge, and supreme leader [רש"י, רשב"ם, ביאור שטיינזלץ], directing Aaron on exactly which wonders to perform [ספורנו]. Their dynamic mirrors the relationship between God and a prophet. Moses rests his spirit upon Aaron, placing the ideas directly into his heart [העמק דבר, ביאור יש"ר].
There are differing perspectives on what this arrangement meant for Moses spiritually. On one hand, it can be seen as an immense elevation of his status. In this view, Moses is compared to an invisible soul or an angelic being, while Aaron acts merely as the physical body and mouth carrying out its will [הטור הארוך]. On the other hand, some suggest that Moses actually suffered a loss through this setup. Had he agreed to speak to the people himself, the Israelites would have absorbed the Divine message directly from his personal spiritual power. Because the words now had to pass through Aaron as an intermediary, the raw intensity and impact of the Divine message were ultimately diminished [מלבי"ם].