Reference for Sanhedrin 62:4

תיובתא דרב נחמן (תיובתא)

must be authenticated by the signatories. If unwitnessed, but produced by a trustee, or if written on the note of indebtedness, under the signatures of the witnesses, it is also valid.<span class="x" onmousemove="('comment',' For the note is in the creditor's possession, and he would certainly not have permitted a false receipt to be written thereon. ');">³</span>

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