Reference for Ketubot 173:11

<big><strong>מתני׳</strong></big> הפוגמת כתובתה לא תפרע אלא בשבועה עד אחד מעידה שהיא פרועה לא תפרע אלא בשבועה מנכסי יתומים ומנכסים משועבדים ושלא בפניו לא תפרע אלא בשבועה

A woman who impairs her kethubah is not paid except by an oath. If one witness testifies against her that [her kethubah] has been paid, she is not be paid except by an oath. From the property of orphans, from property with a lien on it and [from the property of] an husband who is not present she is not paid except by an oath.

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