מילון על דברים 12:3

In Deuteronomy (12:3) God says to Moses and Aaron to tell the Jews that each should take a lamb for the Paschal offering. Rabbi Ishmael asked: “Is it possible that both heard the words of God and that both spoke to the Jewish people?” But he explained it to mean that when Moses spoke, Aaron listened attentively to what he had to say, and it was considered as if both heard the words of God.