In the context of understanding the role of a prophet, Aaron, the brother of Moses, is highlighted as an example of a true prophet. As described in Exodus 7:1, God appointed Aaron to be Moses' prophet, just as Moses was God's prophet. Due to Moses' doubt in his own ability to speak, God would communicate His message to Moses, who would then relay it to Aaron to speak to others, particularly Pharaoh. This role of speaking for another defines Aaron's prophetic function, emphasizing the delivery of God's ordained message over the performance of miracles or predictions of future events.

Aaron served as Moses' prophet according to the biblical account. In this role Aaron functioned as a message carrier from one of greater authority. God instructed Moses to speak all that He commanded and Aaron would speak unto Pharaoh. Aaron was to be a spokesman unto the people and Moses was to be to him instead of God. The text states that Aaron the Levite was Moses' brother and that God knew he could speak well. Moses was to put words in Aaron's mouth. This arrangement made Aaron Moses' prophet while Moses served as God's prophet to Aaron. The relationship between Moses and Aaron illustrates the definition of a prophet as one who speaks for another. Aaron carried the message from Moses to Pharaoh and to the people. The prophet's function in this case was to express the will of God in words. Aaron's position shows that the office of prophet was not limited to direct communication from God to men but could also occur from one man to another.