The prohibition of a woman’s sister[1]
ואשה אל-אחתה לא תקח לצרר לגלות ערותה עליה בחייה
A woman, do not take her sister in marriage, to cause quarrelling, to reveal her nakedness upon her in her lifetime[2]
At the end of the parsha, we are taught a series of forbidden relationships, one of which is the prohibition of marrying one’s wife’s sister. However, the verse is expressed in a strange way. It says, “a woman, do not take her sister in marriage”. Now, the prohibition isn’t to marry any woman who is a sister. Only one’s wife’s sister. Why doesn’t it say don’t marry your wife’s sister? Or your sister-in-law?