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Apostasy in Judaism

Formal disaffiliation from the Jewish religion

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Classes of apostates and relevance

A mumar is someone who does not observe a certain mitzvah or who observes no mitzvot at all. Rabbinic categories differentiate between a mumar ledavar echad (מומר לדבר אחד)—one who foregoes observance a certain mitzvah—and a mumar lekhol hatorah kulah (מומר לכל התורה כולה)—one who observes none of the Torah. Likewise, they differentiate between a mumar l'teyavon (מומר לתיאבון), who transgresses mitzvah(s) wantonly due to craving (teyavon) or convenience, versus a mumar l'hakh`is (מומר להכעיס), meaning one who transgresses out of spite, who defies the mitzvah willfully.

Some halakhic aspects of the status of a mumar include the following: a mumar is considered akin to a gentile in matters related to commerce; it is prohibited to lead them into actions that are forbidden; in the context of matrimony, ritual purity, and inheritance (with certain exceptions), they are classified as an Israelite; and the sages established that there is no mourning for a mumar.

However, today, another category, tinok shenishba ("captured infant"), a Jew who sins as a result of having been raised without sufficient knowledge and understanding of Judaism, is widely applied and should be considered. A tinok shenishba is not halakhically classified as a mumar, regardless of how much of Halakha they observe.

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