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The Rambam’s view · Bekhorot 43 · בכורות מ״ג
The Rambam on Human Blemishes and Temple Service
How the Rambam categorizes physical defects in kohanim, and why human-specific abnormalities do not profane the sacrificial service.
The Three Categories of Bodily Defects
The Mishnah in Bekhorot establishes that physical blemishes that disqualify animals also disqualify a priest from serving in the Temple. In addition, human beings possess unique anatomical abnormalities that disqualify them, even though such forms are not bodily injuries. The Gemara derives this human-specific category from the scriptural requirement that a serving priest must be שָׁוֶה בְּזַרְעוֹ שֶׁל אַהֲרֹן (standard in form among Aaron's descendants).
The Gemara then asks what legal difference exists between these classes of disqualification. A universal blemish that applies to both man and animal causes חִלּוּל עֲבוֹדָה (profaning the service) if the priest officiates. By contrast, a priest who merely lacks the uniform appearance of Aaron's seed is disqualified, but his service does not profane the offerings post facto.
מוּמָא מַחֵיל עֲבוֹדָה, דִּכְתִיב: ״מוּם בּוֹ וְלֹא יְחַלֵּל״, שֶׁאֵינוֹ שָׁוֶה בְּזַרְעוֹ שֶׁל אַהֲרֹן לָא מַחֵיל עֲבוֹדָה.A blemish profanes the service, as it is written: 'He has a blemish; that he not profane.' One who is not equal among the seed of Aaron does not profane the service. (Bekhorot 43b:1)
The Rambam's Ruling on Disqualification
The Rambam rules that any bodily blemish invalidates a kohen from entering from the altar inward and performing Temple service. This applies equally whether the priest possessed the defect congenitally from birth or developed it later. It also applies whether the defect is permanent or transient.
Kiryat Sefer notes that the Torah broadens disqualification to include all visible defects, treating the biblical list as exemplary rather than exhaustive. A transient blemish disqualifies the kohen only as long as it lasts, and permits him to resume service as soon as it heals.
כָּל הַמּוּמִין כֻּלָּן אֶחָד שֶׁהָיוּ בּוֹ מִתְּחִלַּת בְּרִיָּתוֹ וְאֶחָד שֶׁנּוֹלְדוּ בּוֹ אַחַר כֵּן בֵּין עוֹבְרִין בֵּין שֶׁאֵינָן עוֹבְרִין הֲרֵי זֶה פָּסוּלAll physical blemishes—whether the priest had them from the start of his creation or acquired them afterwards, whether they will heal or will not heal—behold, he is disqualified. (Mishneh Torah, Admission into the Sanctuary 6:3)
Lashes Versus Profanation of the Service
Commentators note an apparent tension between the Rambam and our sugya. The Gemara states that the distinction between a priest who is not equal to Aaron's descendants and one with an unsightly appearance of מַרְאִית הָעַיִן is merely an עֲשֵׂה (positive commandment). Yet the Rambam rules that a priest with human-specific defects receives מַלְקוּת (lashes) if he serves intentionally.
Even Ha'azel resolves this by explaining that the Rambam considers human anomalies to be full biblical blemishes governed by the negative prohibition against serving. Scripture restricts only the post-facto invalidation of the sacrifice to universal blemishes,. The priest therefore incurs lashes for intentional service, even though the offerings he presented remain valid.
Classifying Head Defects and Systematic Order
The Mishnah details cranial abnormalities that disqualify a kohen, such as a pointed head or a mallet-shaped skull. The Gemara describes these in terms of protruding or flattened shapes,. The Rambam restructures these blemishes into geometric pairs, contrasting depressions against protrusions.
The Ra'avad sharply criticized the Rambam for altering the order and definitions found in the Gemara. Defending the Rambam, Mahari Kurkus explains that the Mishnah never intended a rigid sequence. Instead, the Rambam systematically organized the defects by pairing complementary anomalies so that they could be easily memorized and retained.
אבל רבינו שהוא המחבר חברם וסדרם בסדר נכון זה לעומת זה באופן יתקבלו ויזכרו.But our Master, being the compiler, composed and ordered them in a proper arrangement, one opposite the other, in a manner that they may be grasped and remembered. (Commentary of Mahari Kurkus and Radbaz on Mishneh Torah, Admission into the Sanctuary 8:1:1)
Practical Consequences in Temple Halacha
In practical halacha, three clear tiers emerge for priests who possess bodily flaws. If a kohen has a universal blemish, such as a fractured limb, he is biblically forbidden to serve, incurs lashes for serving intentionally, and retroactively profanes the sacrifices.
If he has a human-specific structural flaw, such as an abnormal skull shape, he violates a Torah prohibition and receives lashes, but the sacrifices remain valid בדיעבד. Finally, if his defect is merely rabbinic due to cosmetic appearance, such as fallen eyelashes, he incurs no lashes and his service is uncompromised.
Universal blemishes invalidate both the priest and the sacrifice, whereas human-specific anatomical defects disqualify the priest without profaning the Temple service.