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1. The Gemara explains why the Rabanan do not require the Kohen Gadol to have a second wife when he performs the Avodah on Yom Kippur.
2. The Gemara says that we derive from the verse, "and for his house," that one is not permitted to marry two wives.
3. The Gemara says that Rebbi Yehudah maintains that the Kohen Gadol marries a second wife and then gives her a conditional divorce.
4. A man cannot give a Get to his wife, making it contingent upon his wife never doing a certain act in her life again.
5. There is a dispute about what an ordinary Kohen should do if a close relative dies while he is performing the Avodah in the Beis ha'Mikdash.
A BIT MORE
1. Even though the Rabanan required the Kohen Gadol to stay away from any possibility of becoming Tamei before Yom Kippur, they did not require that the Kohen Gadol marry another wife in case his first wife dies, because they maintain that becoming Tamei is common, but dying is not.
2. Based on this derivation, the Gemara questions the view of Rebbi Yehudah, who says the Kohen Gadol must have a second wife in case his first wife dies because the verse says "his house," i.e. his wife, meaning that he must be married.
3. The Gemara discusses at length what contingency is made in this conditional divorce in order to achieve both being married to the second woman in the event that his first wife dies, and not being married to the second woman in the event that his first wife does not die (see #2 above).
4. This is because a Get must result in a complete severance of the relationship ("Sefer Kerisus"). If a condition is in effect on her for her entire life, then she is still bound to him and the severance is not complete.
5. Rebbi Yehudah: He should immediately stop performing the Avodah and attend to his relative. Rebbi Yosi: He should finish the Avodah.
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