Reference for Eruvin 193:13

מודה רבי בצבתים דמתרי תלתא גברי זבין אי הכי אפילו רביעי נמי ואפילו חמישי נמי

Rabbi who laid down that if something has happened twice presumption is established.<span class="x" onmousemove="('comment',' Cf. Yeb. 64b.');">²⁹</span> But if this<span class="x" onmousemove="('comment',' R. Kahana's ruling.');">²⁷</span> represents the view of Rabbi, read the final clause: 'The same procedure is followed<span class="x" onmousemove="('comment',' Of course it should, since the validity of the goods of one seller is no proof of the validity of those of any other.');">²⁵</span>

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