Mesorat%20hashas for Niddah 8:22

בדקה עצמה בשעה ראשונה ומצאת טהורה וישבה לה שניה ושלישית ולא בדקה ולרביעית בדקה ומצאה טמאה אין אומרים

and found herself to be clean and then she spent Monday and Tuesday without holding any examination while on Wednesday she examined herself and found that she was unclean, it is not ruled that she should be deemed to be unclean retrospectively from the previous examination to the last examination but only [that she should be deemed to be unclean] during the preceding twenty-four hours. 'And during the period from the [previous] examination to the [last] examination when this lessens the period of twenty-four hours'. How is this to be understood? If the woman examined her body during the first hour of the day and found herself to be clean and then she spent the second and the third hour without holding any examination while in the fourth hour she examined herself and found that she was unclean, it is not ruled that she should be deemed to be unclean retrospectively for a period of twenty-four hours but only during the period from the previous examination to the last examination. But is it not obvious that, since she has examined herself during the first hour and found that she was clean, she is not to be deemed unclean retrospectively for twenty-four hours?<span class="x" onmousemove="('comment',' Of course it is. Why then should such an obvious ruling have to be stated? ');">²²</span>

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