Reference for Shevuot 96:2

וקתני שהבן גובה בין בשבועה ובין שלא בשבועה בשבועה שבועת יורשין שלא בשבועה כרשב"ג

Now, in what circumstances? [Obviously] if the borrower died during the lifetime of the lender;<span class="x" onmousemove="('comment',' The statement that the father exacts payment only with an oath can only refer to a case where the borrower is already dead, and the father');">³</span>

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