Commentary for Niddah 131:49

בנות ישראל החמירו על עצמן שאפילו רואות טפת דם כחרדל יושבות עליה שבעה נקיים

R. Zera stated: The daughters of Israel have imposed upon themselves the restriction that even if they observe a drop of blood of the size of a mustard seed they wait on account of it seven clean days.

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