Nazir 57: Am I Impure, or Is That You?
Opening with questions about the nazir's status - pure or impure? Namely, a third party observed one of two nezirim come in contact with impurity, but he's not sure which. They both have to take action (including sacrifices) accordingly. Also, addressing the general practice of doubtful impurity - which is derived from the case of the sotah woman, as per the private domain.
The skinny
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