Reference for Bava Metzia 11:8

ולאו אמרינן תפיס ממונא מספיקא משתבע נמי מספק

— Therefore say that we apprehend that he may be claiming the payment of a doubtful claim of an old loan. But do we not say that if he appropriates money on the strength of a doubtful claim he will also swear falsely in regard to a doubtful claim? — R. Shesheth, the son of R. Idi, said [in reply]: People will desist from taking an oath in regard to a doubtful claim, while they will not desist from appropriating money their right to which is doubtful. For what reason? — Money can be given back [later]; an oath cannot be taken back.

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