Ketubot 87A

על אפוטרופיא שנעשית בחיי בעלה. רב נחמן אמר רבה בר אבוה: על הפוגמת כתובתה.

It is referring to a woman who became a steward during her husband’s lifetime, as it was common for a man to leave his wife in charge of his property while exempting her from taking an oath. Rav Naḥman said that Rabba bar Avuh said: It is referring to a woman who claims that she received partial payment of her marriage contract, who must take an oath that she received no more than the amount she admits to. The Mishnah is referring to a husband who exempted his wife from this oath.

אזל רב מרדכי, אמרה לשמעתא קמיה דרב אשי: בשלמא למאן דאמר על הפוגמת כתובתה ⁠— דמסקא אדעתה: דלמא מצטרכי לי זוזי ושקילנא מכתובתאי, ואמרה ליה: כתוב לי דלא משבעת לי. אלא למאן דאמר על אפוטרופיא שנעשית בחיי בעלה, איהי מי הות ידעה דמותיב לה אפוטרופיא, דאמרה ליה: ״כתוב לי דלא משבעת לי״?

Rav Mordekhai went and said this halakha before Rav Ashi and asked him the following question: Granted, according to the one who says that it is referring to a woman who claims that she received partial payment of her marriage contract, it makes sense that it enters her mind that this might happen, as she thinks: Perhaps I will require money, and I will take what I need from my marriage contract up front. And she therefore says to him before their marriage: Write for me that you will not administer an oath to me when I come to collect the rest of my marriage contract. However, according to the one who says that it is referring to a woman who became a steward during her husband’s lifetime, did she know beforehand that her husband would establish her as a steward, to know to say to him: Write for me that you will not administer an oath to me?