Rashi on Leviticus 21:21/רש"י על ויקרא כ״א:כ״א

1כל 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).

2מום 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).

3לחם אלהיו THE BREAD OF HIS LORD — any food is called לחם (cf. Rashi on v. 17).