REVACH L'DAF
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SUMMARY
A BIT MORE
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BRIEF INSIGHT
The Gemara says that it is prohibited to teach the laws of Arayos to three students at once. Rashi says that the laws of Arayos include the prohibition of relations with one's daughter from a woman out of wedlock, and a grandmother-in-law, even though they are not explicitly written in the verse. The Maharsha explains that these laws of Arayos refer to the understanding of the prohibitions of some of the Arayos which are difficult to understand. An example is the prohibition of one's sister, since the world was built on the basis of the marriage between Kayin and his sister. Another example is the prohibition against marring two sisters, which is difficult to understand because Klal Yisrael is based on the marriage of Yakov with Rachel and Leah.
QUICK HALACHAH
A woman cannot purify herself from her Tum'ah by washing in a bathhouse. Even if all of the water in the world falls on her, she remains Tamei until she immerses her entire body at once in the waters of a Mikvah or in a spring that contains 40 Se'ah. The Mikvah must be at least one Amah by one Amah with a height of three Amos (using an Amah comprised of is six Tefachim and half an Etzba wide). If the Mikvah is wider than the minimum width at the expense of its depth, it is valid if the woman is able to immerse her entire body in it at once. (Shulchan Aruch YD 201:1)
The minimum size of a spring applies only to the immersion of a person who is Tamei. In contrast, for the immersion of Tamei utensils, a spring has no minimum size. (Taz)
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