Eruvin 4 – עירובין ד

If there is a Chatzitza present on most of the hair, the Tevillah is passul.  Rashi describes the hair being knotted one by one.  Why is this considered a Chatitza on most of the hair if only a minute portion of each hair contains the knot (which prevents water from entering the interior of that knot)?

We learn that Shiurim were learned from Sinai.  We also learn about the seeming uncertainty as to the exact size of an Amma.  How can there be a safek about something which was taught through a Halacha lemoshe misinai (see Ramba”m’s Introduction to Mishnah)?

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Eruvin 4 – עירובין ד

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Today’s Daf Yomi Question:

If there is a Chatzitza present on most of the hair, the Tevillah is passul.  Rashi describes the hair being knotted one by one.  Why is this considered a Chatitza on most of the hair if only a minute portion of each hair contains the knot (which prevents water from entering the interior of that knot)?

We learn that Shiurim were learned from Sinai.  We also learn about the seeming uncertainty as to the exact size of an Amma.  How can there be a safek about something which was taught through a Halacha lemoshe misinai (see Ramba”m’s Introduction to Mishnah)?

Eruvin 93 – עירובין צג

Rashi explains that one needs to be able to see the Mechitza of ten tefachim (according to Rav Chisda).  If so, even when the ground is elevated a full ten tefachim but there is a shallow Mechitza at the edge (blocking view of the ten tefach elevation) how can it be considered a Mechitza?

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