THIS SHABBOS IS also Parashas Parah. As we learn in Parashas Naso, a person who has become defiled by contact with the dead (no, not through a séance) is ineligible to eat from the Korban Pesach. By being sprinkled with the water of the Parah Adumah (Red Heifer) was the process a person underwent to become ritually pure again. Hence, we recall that halachah in advance of Pesach.