Not to burn its (blemished animal's) fat

This mitzvah forbids burning the sacrificial fats (cheilev) of blemished animals upon the Mizbeach. The burning of fats and certain parts of the korban is a central ritual act meant to honor Hashem. Performing this service with a blemished animal undermines the sanctity of the avodah and profanes the altar.

Rambam explains that the Torah created four distinct prohibitions concerning blemished animals: consecrating them (337), slaughtering them (338), sprinkling their blood (339), and burning their fats (340). Each stage of sacrificial service must be preserved in holiness, with the Torah teaching that imperfection is unacceptable at any step.

Sefer HaChinuch emphasizes that Hashem’s service must radiate reverence and respect; burning the fats of unfit animals profanes His honor rather than sanctifying it. The Talmud clarifies that this act carries liability because burning on the altar is considered one of the most significant acts of avodah. Ramban teaches that this mitzvah instills a lesson: only offerings that reflect completeness and dignity are acceptable before Hashem.

Commentary & Classical Explanation:

• Rambam (Hilchot Issurei Mizbeach 1:7–8): Counts burning the fats of blemished animals as a distinct prohibition.
• Sefer HaChinuch (Mitzvah 289): Explains that burning blemished fats defiles the sanctity of Hashem’s altar.
• Rashi (Lev. 22:24): Notes that the Torah explicitly rejects blemished animals from being “brought near” on the altar by fire.
• Talmud (Zevachim 24a–25a): Discusses the liability incurred for burning fats of blemished animals, emphasizing the sanctity of each stage of the avodah.
• Ramban: Teaches that Hashem demands dignity and perfection in offerings; burning blemished fats dishonors His altar.