必是先定「沾书卷的手」,后定「手一概不洁」。
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既先定了那一条,何必再定这一条「沾了圣卷的手为不洁」呢?
once they decreed that first, why do I need that decree of impurity on hands that touch a sacred scroll as well?
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众贤既已定手一概为不洁,就不必再定沾过 妥拉 书卷的手为不洁了——手横竖总是不洁的。
Once the Sages decreed impurity on hands in general, there is no longer a necessity to decree impurity on hands that touched a Torah scroll, as hands are impure in any case.
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所以必是众贤先定了这一条,就是沾过 妥拉 书卷的手为不洁。
Rather, certainly the Sages decreed impurity on this, hands that touched a Torah scroll, first.
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然后才定手一概为不洁。
And then they decreed impurity on all hands.