The Anger Against Moses and the Priesthood He Lost

"And the anger of the LORD was kindled against Moses" (Exodus 4:14). Rabbi Yehoshua ben Korcha says: Every kindling of anger stated in the Torah leaves a mark, except this one, in which no mark is stated. Rabbi Shimon ben Yochai says: This too leaves a mark, as it is said, "Is there not Aaron your brother the Levite?" - and is he not a priest? This is what it says: I had said you would be a priest and he a Levite; now he is a priest and you are a Levite. And the Sages say: Moses served as priest only during the seven days of consecration alone. And some say: it ceased only from the seed of Moses, as it is said (Psalms 99:6), "Moses and Aaron among His priests, and Samuel among those who call on His name." What is the force of "and it says"? Should you say that this verse is written about later generations, therefore "it says": "Moses and Aaron among His priests." And does every kindling of anger in the Torah leave a mark? But is it not written, "and he went out from Pharaoh in hot anger" (Exodus 11:8), and he said nothing to him? Resh Lakish said: He slapped him and went out. But is it not written (Exodus 7:15), "and you shall stand to meet him at the bank of the river"? And Resh Lakish said: He is a king, so show him a pleasant face; and Rabbi Yochanan said: He is wicked, so be brazen toward him - reverse them.