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Iyun of the day · Bekhorot 43 · בכורות מ״ג
Priestly Bodily Anomalies Versus Formal Blemishes
אינו שוה בזרעו של אהרן
A priest with an abnormally shaped head is barred from the altar, yet his service does not profane the sacrifice. Does such a defect constitute a formal blemish, or an entirely distinct category of priestly suitability?
The Torah disqualifies any priest who bears a מום (blemish) from offering sacrifices in the Temple, as detailed in Leviticus. The Mishnah lists defects that disqualify both sacrificial animals and human priests alike.
In Bekhorot 43a:22, the Mishnah introduces a set of defects that apply exclusively to priests (יתר עליהן באדם), such as a pointed or turnip-shaped head. The Gemara asks for the scriptural source for these unique priestly disqualifications.
Rabbi Yoḥanan cites the syntax of Leviticus 21:21: a priest must be an איש ששוה בזרעו של אהרן ("a man equal among the seed of Aaron"). His bodily form must match the standard physical appearance of his brethren.
The question
Is being physically unequal to the seed of Aaron a unique sub-category of a מום (formal blemish), or an independent disqualification of priestly status?
Through the sources
The Gemara (Gemara)
The Gemara establishes that an anomalous priest does not profane the service post facto (בדיעבד), unlike a priest with a true blemish.
The Gemara (Gemara)
מַאי אִיכָּא בֵּין שֶׁאֵינוֹ שָׁוֶה בְּזַרְעוֹ שֶׁל אַהֲרֹן, וּמִשּׁוּם מַרְאִית הָעַיִן? אִיכָּא בֵּינַיְיהוּ עֲשֵׂה.Between an unequal priest and rabbinic appearance defects (מראית העין), the difference is the violation of a positive biblical commandment.
Rashi (Rishonim)
איש השוה בזרעו של אהרן - הוא דבעי מומא הא אין שוה בזרעו של אהרן בלא מומא נמי מיפסיל:An equal priest requires a formal blemish to be invalid, but an unequal priest is disqualified without a blemish.
Rashi (Rishonim)
The prohibition is derived implicitly from positive phrasing, meaning it functions legally as a positive commandment without lashes.
Rabbeinu Gershom (Rishonim)
לא פסילי מדאורייתא אלא משום דבעינן איש ששוה בזרעו של אהרן:These physical irregularities are not defined by the Torah as blemishes, but stem solely from a requirement of standard appearance.
Commentary on Sefer Hamitzvot of Rasag (Acharonim)
Citing the Tosafot Yom Tov, he explains that according to the Rambam, an unequal priest who serves incurs lashes for his service.
Even Ha'azel (Acharonim)
The Rambam categorizes these bodily anomalies as a distinct category of blemish specific to priests, subject to the standard negative prohibition.
Ways to understand it
Independent Priestly Disqualification
An irregular bodily shape is not a מום (blemish) at all. It is an independent disqualification in the priest's personal pedigree and suitability, derived as a negative commandment resulting from a positive commandment (לאו הבא מכלל עשה). Because it lacks the legal status of a true blemish, it neither incurs lashes nor profanes the sacrifice.
Lineage-Specific Blemish
The Rambam views being unequal to Aaron's seed as a true מום, but one that applies exclusively to the human anatomy of priests. Therefore, serving with this defect violates the standard biblical negative prohibition against blemished service and incurs lashes, yet the Torah explicitly restricted retroactive invalidation (חילול עבודה) to universal blemishes.
Where it lands
The Gemara rules definitively that if an unequal priest serves, he does not profane the service post facto. According to Rashi, he violates only a positive commandment. However, the Rambam (as analyzed by the Even Ha'azel and Commentary on Sefer Hamitzvot of Rasag) codifies that he receives lashes, because bodily abnormalities unique to man still fall under the Torah's negative command against blemished priests.
An anomalous physical form disqualifies a priest from approaching the altar, yet it lacks the power to profane the sacrificial service.