Responsa for Bava Metzia 5:19

Q. If a litigant is proven to have lied in respect to one of his claims, is he considered untrustworthy in respect to his other claims so that he becomes disqualified from taking an oath?
A. He is still to be trusted under oath regarding his other claims.
SOURCES: Cr. 297; Am II, 235; Mord. B. M. 227.

Q. A demands that Leah return to him the money he deposited with her. Leah claims that A deposited the money with her on condition that she do not return it to him without his wife's consent. [A's wife does not consent to the return of the deposit]. Are we to believe a trustee who was appointed by the two opposing parties regarding the terms of his trusteeship, or may we require him to take an oath? Moreover, Leah is a married woman. May her husband object to her being degraded by imposing an oath on her?
A. A trustee appointed by both parties is not required to take an oath regarding the terms of his trusteeship. But, Leah was not appointed trustee by both parties. She was only appointed by the husband, and, therefore, is required to take an oath. Leah's husband cannot object to imposing an oath on her. If the law requires that a woman take an oath, the husband has no right to protest against her being degraded in court. But, since Leah, as long as she is married, has no money of her own, and were she to claim that she had already returned the deposit, no oath would be imposed on her, we now lend credence to her words and require no oath. However, the court should give A a writ stating that after Leah will be divorced or widowed she will have to return the money to A or take an oath to the effect that A deposited the money with her on condition that she return it upon his wife's consent only.
SOURCES: L. 306–7; Mord. B. K. 89. Cf. Pr. 739; Tesh. Maim. to Mishpatim, 44.