The halakhah discussion that is framed by the methodology question of rules of thumb of whose p’sak holds away. Cases pertain to women who were required to wait 3 months before getting married, lest she be pregnant from a previous marriage. This delay assures sure knowledge (presumably) of paternity. Also: One who buys from non-Jews, when in the Land of Israel, redeems all kinds of things. A kohen can leave the Land of Israel and make himself impure if he needs to legislate something in a court. And he can likewise go to a cemetery. (Wait, what?!) There are places that are rabbinically impure, and not the standard. Likewise, he can leave the Land of Israel to find a wife, to learn Torah. The implication for the status of kohanim is significant, of course. And bringing us back to eruvin – do the objects of a non-Jew establish residence (with regard to techum on yom tov)?
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