Why was it necessary to anoint Aharon?s sons, seeing as no subsequent Kohen Hedyot needed to be anointed?
Seforno: Because, as opposed to subsequent Kohanim, they were born before Aharon was chosen as Kohen Gadol. 1 Consequently, had they not been anointed, they would not have been Kohanim.
Seforno: Like Pinchas, who was not initially a Kohen, because he was already born when his father Elazar waas anointed.
What are the connotations of the words "asher Milei Yadam Lechahen"?
Rashi (in Zevachim, 13a): It refers to the inauguration that took place via the Bigdei Kehunah. 1
Rashi, ibid.: As in Tetzaveh Sh?mos, 29:29 and in Emor Vayikra, 21:10. And it teaches us that Aharon's sons were inaugurated both by being anointed with the Shemen ha'Mishchah and by wearing the four Bigdei Kehunah for the first time.