אמר אל הכהנים בני אהרן ואמרת אליהם לנפש לא יטמא בעמיו
Chazal (Midrash Vayikra Rabbah 26:6) quotes the pasuk in Sefer Tehillim (19:10), Yiraas Hashem tehorah omedes la’ad, “Fear of Hashem is pure, it will stand for all eternity.” Rav Levi said, “Because Aharon HaKohen maintained such fear of Hashem, he was given this parsha, which will accompany his children and their descendants until the end of time.” Which parsha is this? The parsha which addresses the avoidance of impurity. It sounds as if the primary requirement imposed upon the Kohanim is the mandate that they maintain a heightened level of purity. What about the prohibition against marrying a divorcee or…