Moses, the one who had the direct encounter with God, let Aaron do the talking. Why would God orchestrate it this way?
This passage reveals a thoughtful division of labor, ordained by God. While Moses had the intimate experience of the burning bush and received the core message, Aaron, his brother, was the appointed spokesperson to the people. This wasn't because Moses was incapable; the text implies he had a speech impediment. More profoundly, it served a divine purpose: it demonstrated that the authority came from God, not just Moses. By having Aaron speak, it validated Moses's commission and ensured the message was delivered clearly and with the weight of both brothers' authority, sanctioned by God. It also highlights Aaron's role as a bridge, connecting Moses's prophetic word to the people's understanding.