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Why is the case of a safek chalal who marries into a family considered a sfeik sfeika when the Avnei Miluim argues it should be safek echad beguf, safek echad betaruvus? The shiur develops a chiddush distinguishing between paskening on the person with the safek versus paskening on those affected by that person. When we're determining the woman's status rather than the man's, we get a genuine sfeik sfeika.
This shiur addresses a fundamental question in the sugya of chalal on Kesubos 14a regarding the nature of sfeik sfeika versus safek echad beguf, safek echad betaruvus. The Gemara (גמרא) discusses a case where a safek chalal falls into a family, and Tosfos maintains this creates a sfeik sfeika for any woman who marries someone from that family. The centuries-old question is: why isn't this simply safek echad beguf, safek echad betaruvus, which would render everyone assur? The Beis Meir attempts to resolve this by comparing it to a case in the Shach involving chickens and eggs. In the Shach's case, when you have one kosher chicken and one safek treif chicken, and find an egg, it's a sfeik sfeika because either the egg came from the kosher chicken, or if it came from the safek chicken, maybe that chicken was actually kosher. However, the Avnei Miluim strongly objects to this comparison, arguing that if both chickens were safek treif (mixed up so we don't know which is which), then both mothers would be assur, and any egg would also be assur - not a sfeik sfeika.
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Kesubos 14a
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