Levítico 21:21 Comentario: Rashi, Or HaChaim, Siftei Chakhamim & Rav Hirsch

כָּל־אִ֞ישׁ אֲשֶׁר־בּ֣וֹ מ֗וּם מִזֶּ֙רַע֙ אַהֲרֹ֣ן הַכֹּהֵ֔ן לֹ֣א יִגַּ֔שׁ לְהַקְרִ֖יב אֶת־אִשֵּׁ֣י יְהוָ֑ה מ֣וּם בּ֔וֹ אֵ֚ת לֶ֣חֶם אֱלֹהָ֔יו לֹ֥א יִגַּ֖שׁ לְהַקְרִֽיב׃

Ningún varón de la simiente de Aarón sacerdote, en el cual hubiere falta, se allegará para ofrecer las ofrendas encendidas de SEÑOR.  Hay falta en él; no se allegará á ofrecer el pan de su Dios.

Rashi

כל איש אשר בו מום NO MAN THAT HATH A BLEMISH… [SHALL COME NEAR] — This is intended to include in the prohibition (besides the blemishes expressly mentioned in vv. 18—20) also other bodily blemishes (Sifra, Emor, Chapter 3 1).
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Or HaChaim

כל איש…מזרע אהרון, "Any man of the descendants of Aaron..who has a blemish,etc." The reason the warning has been repeated is to alert the Israelites that they must not allow a priest who suffers from such a blemish to perform sacrificial service. The Torah phrased this warning in indirect speech to make clear it was not addressed to the priest directly.
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Siftei Chakhamim

To include other blemishes. Because if not so, why does it repeat “Any man who has a blemish” a second time? It is already written above (verse 17), “Anyone of your offspring, through [all] their generations who will have a blemish, etc.”
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Rashi

מום בו HE HATH A BLEMISH — These apparently redundant words imply: so long as he has the bodily blemish he is unfit for priestly service; (the translation is: מום בו while the blemish is in him, '‎לא יגש וכו‎ he shall not approach to offer); consequently, if his blemish disappears, he becomes again fit for it (Sifra, Emor, Chapter 3 6).
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Rashi

לחם אלהיו THE BREAD OF HIS LORD — any food is called לחם (cf. Rashi on v. 17).
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