Commentary for Niddah 19:3

פעם ראשונה ושניה דיה שעתה שלישית מטמאה מעת לעת ומפקידה לפקידה

— R. Giddal citing Rab replied: After the first time and after the second time it suffices for her to reckon her uncleanness from the time of her observation of the discharge, but after the third time she causes uncleanness retrospectively for twenty-four hours or from her previous examination to her last examination.

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