Bearing in mind that the Torah (in Parshas Tzav) has already informed us that an Asham must be Shechted on the north side of the Azarah, why does it see fit to write "ve'Shachat es ha'Keves bi'Mekom asher Yishchat Es ha'Chatas"?
Rashi: Because, since the Asham Mitaher differs from other Ashamos in that it needs to be placed by the Sha'ar Nikanor, 1 we might have thought that it is Shechted there, too.
See Sifsei Chachamim.
What does the Torah mean when it writes "Ki ka'Chatas ha'Asham hu la'Kohen"? Why does it need to tell us that?
Rashi: It teaches us that regarding all Avodos
QUESTIONS ON RASHI
Rashi writes that it says "bi'Mkom Asher Yishchat
Zevachim 49b: Since it did not suffices to say 'where the Chatas is slaughtered', this teaches that something learned from a Hekesh (Chatas was learned from Olah) cannot return to teach through a Hekesh. 1
I do not know why Moshav Zekenim left this difficult. (PF)
Rashi writes that Asham Mitaher left the Klal of Ashamos
Riva: Something that left a Klal teaches about the Klal only when it is similar to the Klal, like I said above (refer to Shemos 12:15:153:2).