Reference for Niddah 73:23

בודקין אותו ברביעית אין בודקין אותו לקרבן אמרתי ולא לסתירה

The question was raised: Is it included in the counting?<span class="x" onmousemove="('comment',' Sc. if the birth took place during the seven days following a zibah, and the days following it were free from all discharge, are these days counted as clean ones and make up the required number of seven? ');">²⁰</span>

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