Aharon's Atonement and the People

וכפר בעדך ובעד העם...
"And make atonement for yourself and for the people". We learn from this that Aharon's own atonement effected the atonement of Klal Yisrael. This is because Aharon's sin was brought about through Klal Yisrael. Had they not demanded from Aharon that he make an idol for them, none of all this would have happened. As long as Aaron had not obtained atonement for his part in the Averia, both the one who did the Averia and the one who had been the prime cause of that Averia still remained guilty. As soon as Aaron obtained atonement, so did the people. We derive all this from the linkage of the two atonements in this verse i.e. "on your behalf and on behalf of the people."