Da'at Zekenim on Leviticus Chapter 18
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**ואל אשה.**לפי שהוא מצוי אצלה בימי טהרתה שייך למימר שלא תקרב ביאתה אלא המתן עד שתטהר:
Daat Zekenim translated by Rb. Eliyahu Munk
ואל אשה בנדת טמאתה לא תקרב, “and you shall not approach a woman when she is having her period, etc.” seeing that her husband is normally physically close to her, the Torah has to issue this additional warning. He must keep his distance from her until she has regained her ritual purity.