Reference for Niddah 104:23

כשבאתי אצל רבי עקיבא אמר לי

<b><i>GEMARA</i></b>. Who are THE SAGES? — R. Hanina b. Antigonus. For it was taught: R. Hanina b. Antigonus ruled, In the case of blood-stains there is no [need to consider the possibility of their being] due to <i>zibah</i>, but sometimes blood-stains do lead to <i>zibah</i>. How so? If a woman<span class="x" onmousemove="('comment',' On three consecutive days respectively during the period in which she is susceptible to zibah, ');">¹⁸</span>

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