Rashi on Leviticus 22:2/רש"י על ויקרא כ״ב:ב׳

1וינזרו THAT THEY KEEP AWAY [FROM THE HOLY THINGS etc.] — The term נזר always denotes “keeping aloof". Similarly it is said (Ezekiel 14:7) "and he separates himself (וינזר) from following Me”; (Isaiah 1:4) "They are gone away (נזורו) backward”. The meaning of this verse therefore is: they (the priests) shall keep aloof from the holy things during the time of their uncleanness (Sifra, Emor, Section 4 1).

2וינזרו מקדשי בני ישראל אשר הם מקדשים לי. ולא יחללו את שם קדשי — Invert the words of the verse in the order here set forth and explain it accordingly.

3אשר הם מקדשים לי WHICH THEY HALLOW UNTO ME — This is intended to include in the prohibition the holy things of the priests themselves (i. e. הם refers to אהרן ובניו not to ‎‎בני ישראל‎) (Sifra, Emor, Section 4 1).