Sefer HaMitzvot, Negative Commandments
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הזהיר כהן גדול מהכנס עם מת תחת תקרה ואפילו לקרוביו. והוא אמרו ועל כל נפשות מת לא יבא. וכל זמן שיטמא אפילו לאביו ולאמו לוקה. (שם, שם):
Sefaria Edition 2021, Translated by Rabbi Francis Nataf
He prohibited a high priest from entering under a roof together with a dead body, even for his relatives. And that is His saying, "And adjacent to any dead body he shall not enter" (Leviticus 21:11). And anytime he renders himself impure - even for his father or for his mother - he is lashed. (See Parashat Emor; Mishneh Torah, Mourning 3.)