Rashi on Leviticus 22:7/רש"י על ויקרא כ״ב:ז׳

1ואחר יאכל מן הקדשים [AND WHEN THE SUN IS DOWN HE SHALL BE CLEAN] AND MAY AFTERWARDS EAT OF HOLY THINGS — This is interpreted in Treatise Jebamoth (74b) to have reference to the heave-offering (not to holy things of every description): that he (a priest who was unclean and has bathed) is permitted to eat it as soon as the sun has set.

2מן הקדשים accordingly means: some OF THE HOLY THINGS, but not all holy things (the word מן having a partitive meaning: “some of”).