Augustine of Hippo : One should notice that when Moses is sent to the people, God does not say to him, "Behold, I gave you as a god to the people, and your brother will be your prophet," but he says, "[Your brother] will speak to the people for you." For Scripture had said, "He will be your mouth, and you will be to him as God." It did not say, "You are god to him." But to Pharaoh Moses is said to be given as god, and according to analogy, Aaron is a prophet of Moses, but to Pharaoh. Here it is suggested to us that prophets of God say what they hear from him. A prophet of God is nothing but one who speaks the words of God to men—those who either cannot hear God or do not deserve to. — QUESTIONS ON Exodus 17 Augustine of Hippo : MOSES CALLED THE GOD OF PHARAOH, AND AARON THE PROPHET OF MOSES. — Noteworthy thing! God does not say to Moses, when he sends him to his people: Behold, I have made you the god of your people, and your brother shall be your prophet, but “your brother shall speak for you to the people (Ex. 4:16).” He said to him again, “He will be your mouth, and you will represent him in all that relates to God;” He does not say: You will be his God. But Moses is established the god of Pharaoh, and by analogy, Aaron, the prophet of Moses, however with respect to Pharaoh. It seems to us to follow from this that the prophets of God report the words which they hold of him, and that a prophet is nothing but the mouthpiece by which God addresses his words to men incapable or unworthy of hearing it. (Exodus 7:3) — QUESTIONS ON EXODUS, Q. 17 (tr. J. Litteral, draft)