Commentary for Ketubot 139:12
והתנן קונם שאיני עושה לפיך אינו צריך להפר אלמא כיון דמשעבדא ליה לאו כל כמינה דמפקע ליה לשיעבודיה הכא נמי כיון דמשועבד לה לאו כל כמיניה דמפקע לה לשיעבודה
For surely we have learned: [If a woman said to her husband] “Konam, that which I produce for your mouth” he need not annul her vow. Therefore, since she is obligated to him, she does not have the power to cancel her obligation, so too here since he is obligated to her, he does not have the power to cancel his obligation.
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