Chabad.org — English translation + Rashi
Torah Temimah points to Zevachim 45a (unit 2; single primary locus per emergency Core plan).
E-Daf.com — Zevachim 45a
HebrewBooks / Shas PDF
English: “And the kohen shall take,” next to “and he shall slaughter it in the place where the olah is slaughtered” — learn from this that kabbalah of chatas blood also requires the north.
Northern kabbalah for chatas blood — receiving the blood of the nasi’s chatas must be done in the north.
Just as the shechitah of the nasi’s chatas occurs in the north, so too the kabbalah of its blood must take place in the north. The proximity of the two clauses in the text supplies the derivation. Kabbalah performed south of the altar does not satisfy the requirement.