Reference for Niddah 73:13

לאיי האי נמי גורם הוא

Come and hear: R. Eliezer ruled, Even after a third discharge he must be examined, but after a fourth one he need not be examined.<span class="x" onmousemove="('comment',' Cf. supra 35a, Naz. 65b. ');">¹¹</span>

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