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If a Zav emits both Shichvas Zera and Zivah during his days of counting and it is a Safek whether he emitted them together or separately he must count again 7 days. (1)
Shichvas Zera is Metamei b'Maga.
Rebbi Eliezer says that the Shichvas Zera of a Zav is not Metamei b'Masa, but R. Yehoshua says that it is Metamei b'Masa because of the Zivah that is inevitably mixed in.
If a person sees Zivah within 24 hours of seeing Keri the Zivah is not Metamei.
If a Ger emits Zivah immediately upon becoming a Ger he is Tamei even though he emitted Keri within the previous 24 hours. (2)
The Tana Kama says that the Shichvas Zera of a Zav is Metamei b'Masa for 24 hours and R. Yosi says that it is Metamei b'Masa for the remainder of the day.
R. Nehorai says that Shmuel was a Nazir while R. Yosi says that Shmuel was not a Nazir. (3)
It is Machlokes Tana'im whether it is preferable to be the one to recite a Berachah or the one to say Amen.
Talmidei Chachamim increase Shalom in the world.
A BIT MORE
1. If a Zav emits Zivah mixed with Shichvas Zera during his seven days of counting he must recount one day, while if he emits Zivah alone during his seven days of counting he must recount from the beginning. If it is a Safek whether he emitted them separately or alone he must recount from the beginning.
2. Since he emitted the Keri while he was still a non-Jew it does not affect the status of the Zivah that he saw after becoming a Ger.
3. R. Nehorai learns out that Shmuel was a Nazir from a Gezeirah Shavah from Shimshon.
RECITING A BRACHAH
Rav said to his son Chiya, "Grab and recite a Berachah." The Maharsha says that the purpose of a Berachah is to silence the persecutors of a person in Heaven who attempt to fight against a person from receiving Mezonos b'Shefa from Hashem Yisbarach. The Mezonos of a person comes with great difficulty like Keri'as Yam Suf and by means of reciting a Berachah a person's good deeds are recalled and he will be victorious over the persecutors.
Shmuel was a Nazir Olam, therefore someone who says, "I shall be like Shmuel ha'Ramasi, like Ben Chanah, like Ben Elkanah, like the one who killed Agag in Gilgal," is a Nazir Olam and we do not assume that he was referring to someone else who fits the same description. (Rambam Hilchos Nezirus 3:16)
Index to Revach for Maseches Nazir