Reference for Nedarim 49:3

ומדקאמר על דעתינו מכלל דעביד אינש דמשתבע אדעתא דנפשיה

The creditor thereupon broke the cane in his rage and the money poured out on the ground; it was thus seen that he had [literally] sworn to the truth.<span class="x" onmousemove="('comment',' Hence the exhortation is needed to exclude such oaths, as the defendant may really believe that be is swearing truly. But no person regards his oath as true when he mentally attaches a particular meaning to his words. ');">³</span>

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