(21:1) God said to Moses: Say to Aaron's descendants, the priests, and tell them: Let no priest defile himself by contact with the dead among his people.
Let no priest defile himself by contact with the dead among his people The prohibition applies only when the corpse is “among its own people, ” but when a kohen finds an abandoned corpse in a place where no one else can attend to it, he may not leave it but must bury it (Yevamot 114a).
(21:8) You shall keep thekohenholy, since he presents the food offering to God. He must be holy, since I am God—I am holy, and I am making you holy.
You shall keep thekohenholy It was taught in the yeshiva of R. Yishmael: “You shall keep the kohen holy”—the rest of the nation must recognize the sanctity of priests by showing them respect and giving them precedence. That is why a kohen is called to the Torah first and has priority in leading the assemblage in Grace after Meals (Gittin 59b).