Commentary for Niddah 3:3
הלל אומר
HILLEL RULED: [THEIR PERIOD OF UNCLEANNESS IS TO BE RECKONED RETROSPECTIVELY] FROM THE [PREVIOUS] EXAMINATION TO THE [LAST] EXAMINATION,<span class="x" onmousemove="('comment',' When she discovered the discharge. If the last, for instance, took place at 5 p.m. on a Thursday and the previous one at 8 a.m. on the preceding Sunday, all objects touched since the Sunday examination are deemed to be ritually unclean because it is assumed that some blood, prevented from leaving the body by the walls of the womb, may have made its way into the ante-chamber immediately after that examination. ');"><sup>3</sup></span>
Rashi on Niddah
"Every woman that has a regular time (i.e. menstrual cycle)" - It's set three times [in a row] (i.e. three regular menstrual cycles, one after the other), and she checks herself (i.e. performs a bedikah) at her time and finds herself ritually impure.
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Rashi on Niddah
"...her hour (i.e. the time at which they see menstrual blood) is [a] sufficient (starting point for determining whether the terumot and taharot they handled are ritually impure)" - And [one] cannot say that it (i.e. the blood) was there orginally, for surely a guest [i.e. menstruation] comes on time.
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