Kohen’s Sanctity based upon his Service

The Gemora (Daf Yomi: Nazir 49) answers: Both words are necessary. For if the Torah would have only written for his father (that the nazir may not become tamei to), we would have thought that it is only the father that he cannot become tamei to for there is merely a presumption of paternity (for perhaps his mother committed adultery), but regarding his mother, whom we know gave birth to him, he could become tamei to her (the Torah therefore has to write “his mother” to teach us that he cannot become tamei to her). And if the Torah would have only written for his mother (that the nazir may not become tamei to), we would have thought that it is only the mother that he cannot become tamei to for her children’s lineage is not reckoned through her, but regarding his father, where the halacha is that family is determined by the father, he could become tamei to him (the Torah therefore has to write “his father” to teach us that he cannot become tamei to him).

The following question is asked: Why is the fact that we cannot prove for certain that the Kohen Gadol’s father is truly his father grounds to suggest that the Kohen Gadol may not become tamei to his father? If his father is not his actual father, for that very reason he should be permitted to become tamei to him! If the deceased man (a Kohen) is not his father, the Kohen Gadol is in all probability a Yisroel! Why would we think that he cannot become tamei to him, for he might not be his father? That is precisely the reason why he should be able to become tamei to him!

The Rashba ask a similar question on the Toras Kohanim (Parshas Emor). The verse states that an ordinary Kohen is permitted to become tamei to his father and mother. The Toras Kohanim notes that had the verse said only that he may become tamei to his mother, we might have thought that he would be forbidden to become tamei to his father, because his father is only his father based upon a presumption. He asks that the possibility that the man is not his father should not be a reason to forbid him from becoming tamei to him. On the contrary, it is precisely the reason to permit him to become tamei to him, because if this man is not his father, he is not a Kohen altogether!

The Chasam Sofer (based on Rishonim) explains it as follows: We are dealing with a case where this man was presumed to be a Kohen. He performed the service in the Beis Hamikdosh for many years. When his father dies, if not for the fact that the Torah explicitly permits him to become tamei to him, it would be forbidden. Even though on the chance that the deceased is not his father, he would be a Yisroel, he still would be forbidden to become tamei to him. This is because the verse states: You shall sanctify him, for he offers up the food offering of your God. Since he was allowed to perform the service in the Beis Hamikdosh (based on the presumption that he is indeed a Kohen), he is forbidden to contaminate himself with corpse tumah, even if he is a Yisroel. His sanctity comes about because of his service. This would be the explanation in our Gemora as well.