Yevamot 90: Extreme Measures to Protect the System
The case of a man nullifying a bill of divorce in the presence of the court, while a messenger was bringing the wife the get - he can't do this (she won't know about it!), but if he did it, does it count or not? The court's ability to decide whether his nullification takes effect seems dependent on kiddushin taking place with kesef, money, or an item of monetary value. The question of rabbinic power is very much in play. Plus, a series of examples of the rabbinic level of law, when in comes up against Torah-level laws. Including rabbinic corporal punishment (lashes) as serious enough…
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