For the source text click/tap here: Ketubot 34
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Steinsaltz summarizes our daf as follows:
In the context of discussing how halakha deals with actions that will lead to a person being responsible on two different levels – e.g. he will deserve both a death penalty and to pay as a consequence of what he did,
our daf quotes a Mishna from Massekhet Ḥullin (14a) which teaches that a person who performs shehitah (ritual slaughter) of an animal on Shabbat or on Yom Kippur will receive the death penalty; nonetheless his shehitah will be considered good – the animal will be deemed kosher and can be eaten.
Although this ruling is presented as a straightforward halakha, the rishonim are disturbed by the fact that we ordinarily deem a Shabbat transgressor as a meshumad – an apostate – whose shehitah should be considered invalid!
We explore a number of references to Shechitah and modernity.