פּירוש אויף ויקרא 4:24

במקום אשר ישחט את העלה [AND HE SHALL SLAUGHTER IT] IN THE PLACE WHERE THEY SLAUGHTER THE BURNT-OFFERING — on the north side of the altar which is expressly mentioned in the case of the burnt-offering (Leviticus 1:11) (Sifra, Vayikra Dibbura d'Chovah, Chapter 8 5).

במקום אשר ישחט את העולה, “at the same place as he has to slaughter the burntoffering.” This was done in order not to embarrass a sinner, so that the people would think he is presenting a burnt offering.

In the north. You might ask: It already says in Parshas Tzav (6:18): “In the place where the burnt-offering is slaughtered, the sin-offering shall be slaughtered”! The answer is: This establishes an obligation — that it should be slaughtered only in the north, and if it is not slaughtered in the north, the offering is invalid.

חטאת הוא IT IS [TO BE] A SIN-OFFERING — Consequently, if he slaughtered it for the purpose of (i. e. having in mind that it is) a sin-offering it is valid, but if it is not done for this purpose (i. e. that the officiating priest had another sacrifice in mind) it is invalid (Sifra, Vayikra Dibbura d'Chovah, Chapter 8 6; Zevachim 10b; cf. also Rashi and Zevachim 5b).