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1. Rebbi Eliezer: Four types of women are considered to have had a flow of blood only when they actually see it. Rebbi Yehoshua: I heard that this leniency applies only to one type of woman.
2. The Mishnah defines these four categories (see #1).
3. There is a dispute about the definition of an old woman with regard to this law (see #1).
4. Shmuel states that the law follows Rebbi Eliezer in four cases.
5. Although Rebbi Yehoshua finally agreed with Rebbi Eliezer, in practice he did not apply this leniency until after Rebbi Eliezer died.
A BIT MORE
1. There is no suspicion (even with regard to Taharos) that these women had a flow of blood earlier than they actually saw it. They are: A Besulah, a pregnant woman, a nursing woman, and an old woman.
2. For example, a Besulah refers to a girl who previously had never seen blood, while a pregnant woman refers to someone who is noticeably pregnant.
3. Tana Kama: This refers to any woman, who is close to old age, who has not seen Dam for three periods when the Dam was expected. Rebbi Eliezer: This refers to any woman who has not seen Dam for three periods.
4. One of these is the case of the Mishnah here (see #1).
5. Rebbi Yehoshua did not apply this leniency because he did not want people to follow Rebbi Eliezer's rulings in general, which they might start to do if it became known that the Halachah is like him in this case. However, after Rebbi Eliezer died -- at which time it became permitted to tell people who might start to follow Rebbi Eliezer's rulings that they should not do so -- Rebbi Yehoshua publicly ruled in this case in accordance with the view of Rebbi Eliezer.
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