Variantly: From (Exodus 7:1) "See I have made you an overlord ("elohim") to Pharaoh," I would know that only Moses was set up as a judge to Pharaoh. Whence would I derive (the same for) Aaron? (It is, therefore, written (here) "to Moses and to Aaron." Moses is being likened to Aaron. Just as Moses was a "judge" to Pharaoh, so, Aaron. Just as Moses spoke his words without fear, so, Aaron.