Text by Rabbi Yisroel Bronstein
''Hashem spoke to Moshe after the death of Aharon's two sons'' [Acharei 1:1]
Why, asks Rashi, does the verse state ''Hashem spoke to Moshe after the death of Aharon's two sons''? Why not simply say ''Hashem spoke to Moshe''?
To answer the question, Rashi quotes R' Elazar ben Azaryah's parable: A sick man called for a doctor. The doctor instructed him ''Do not eat cold food, and do not lie in a damp chilly place.''
Then a second doctor came and told the man ''Do not eat cold food, and do not lie in a damp chilly place, so that you will not die like so-and-so did.''
By alluding to somebody who died as a result of not taking these precautions, the second doctor was more successful than the first in rousing the man to take care of himself.
This is why, explains Rashi, the verse states ''after the death of Aharon's two sons''. It was in order to give Aharon an extra measure of motivation to keep the laws enumerated in this portion.