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In page Halakha:

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This division between revealed and rabbinic commandments may influence the importance of a rule, its enforcement and the nature of its ongoing interpretation.[3] Halakhic authorities may disagree on which laws fall into which categories or the circumstances (if any) under which prior rabbinic rulings can be re-examined by contemporary rabbis, but all Halakhic Jews hold that both categories exist[citation needed] and that the first category is immutable, with exceptions only for life-saving and similar emergency circumstances.