Parashas Metzora · Passuk 14:05
Chabad.org — English translation + Rashi
Torah Temima points to Toras Kohanim.
English: “And the kohen shall command and he shall slaughter” — the slaughter itself must also be performed by a kohen.
Ribui from repeated command
Chazal require that the slaughter of the metzora’s bird be performed by a kohen (or at his direct command to another kohen).