Chabad.org — English translation + Rashi
Torah Temimah points to Yerushalmi Pesachim 5:7.
Sefaria — Yerushalmi Pesachim 5:7
English: “And the sons of Aharon shall cause it to go up in smoke” — the valid, and not the invalid.
Miyut of invalid emurim from hakatarah — only valid emurim are burned; pasul portions are not placed on the fire.
Only valid emurim are burned; pasul portions are not placed on the fire. The Yerushalmi reads the command to cause “it” to go up in smoke as limited to that which is fit. Invalid sacrificial portions are therefore excluded from the hakatarah even if they have already been brought to the altar area.