Chabad.org — English translation + Rashi
Torah Temimah points to Toras Kohanim (Sifra), Vayikra Dibbura DeChovah, on 4:24 (ve-shachat oto — it, not its substitute) (unit 3; single primary locus per emergency Core plan).
Sefaria — Sifra / Toras Kohanim, Vayikra Dibbura DeChovah
English: “And he shall slaughter it” — it, and not its temurah.
Miyut of substitute animal — only the designated goat is slaughtered; its exchange-animal is not offered as this chatas.
If the owner designates a different animal as a temurah for the nasi’s goat, that substitute may not be slaughtered under the authority of this verse. The original, designated animal alone is the one that must be offered. The miyut keeps the identity of the chatas fixed and prevents the substitution rules of other offerings from overriding the specific language here.