Reference for Gittin 64:11

רב ששת אמר בפני ג' ב"ד קתני ורב נחמן אמר בפני ב' לבי תרי נמי ב"ד קרי להו אמר רב נחמן מנא אמינא לה דתנן מוסרני לפניכם

IN FORMER TIMES etc. It has been stated: How many must be present at the cancelling? — R. Nahman says two, R. Shesheth says three. R. Shesheth says three, because the Mishnah speaks of a '<i>BETH DIN</i>'; R. Nahman says two, because two are also called a <i>Beth din</i>. Said R. Nahman: What is my ground for saying this? Because we have learnt: [He says:] I hand over in the presence of you

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