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According to the the first mishnah in Ketubot, a virgin is married on Wednesday so that if the husband wants to make a claim against her that she was not a virgin, he can come directly to the court which sits on Mondays and Thursdays and make a claim against her.
If his virginity claim against her is accepted by the court, he may divorce her without paying her the ketubah. The chapter will continue to discuss the issue of virginity claims and how the judge is to adjudicate them.
Rav Yosef quotes Rav Yehudah in the name of Shmuel who teaches that the reason one must get married on Wednesday and not on Sunday is the enactment of "Shakdu." The Rabanan were concerned for the honor of Jewish women, and they enacted that a man must get married on Wednesday so that he spends three days (Sunday, Monday, and Tuesday) preparing a respectable Se'udah for the wedding.
Since one is required to get married on Wednesday because of the enactment of "Shakdu," if an engaged couple's twelve-month period of Erusin ends on a Sunday, the man is not obligated to pay for his bride's support ("Mezonos"), since he can justifiably claim that he is not required to marry her until Wednesday due to the Takanah d'Rabanan.Rav Yosef quotes Rav Yehudah in the name of Shmuel who teaches that the reason one must get married on Wednesday and not on Sunday is the enactment of "Shakdu."
The Rabanan were concerned for the honor of Jewish women, and they enacted that a man must get married on Wednesday so that he spends three days (Sunday, Monday, and Tuesday) preparing a respectable Se'udah for the wedding.
We explore the THE "TAKANAH" OF “SHAKDU" and Solomon Zeitlin’s review article from 1933.