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1. Seven days before Yom Kippur, the Kohen Gadol is segregated from his house.
2. Rebbi Yehudah: The Kohen Gadol must be married when he performs the Avodah, and therefore he marries a second wife in case the first one dies.
3. The Rabanan argue that the Kohen Gadol does not have to marry a second wife.
4. The Kohen Gadol is also segregated for seven days before he burns the Parah Adumah.
5. Before the Kohen would burn the Parah Adumah, they would make him Tamei. He then would immerse in a Mikvah before burning it.
A BIT MORE
1. A substitute Kohen Gadol was designated as his backup, since the service of Yom Kippur is valid only when performed by a Kohen Gadol.
2. He must take an additional wife lest his first wife die, as the verse states, "And he will atone for himself and his house." "His house" refers to his wife, implying that he must have a "house" for whom to atone.
3. The Rabanan do not consider the requirement that the Kohen Gadol be married as a basis for requiring that he marry another wife, since there would be no end to this, since perhaps the second wife will die, and thus he should be married to a third, who also might die, and thus he should be married to a fourth, etc.
4. He waits seven days in a room known as the Lishkas Beis ha'Even which contains only utensils that cannot become Tamei, such as stone and earth.
5. This is done because the Chachamim wanted to show that a Tevul Yom may burn the Parah Adumah, in contrast to the view of the Tzedukim who maintain that one may burn the Parah Adumah only if he is entirely Tahor (and nightfall has already arrived after he became Tahor from his Tum'ah).
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