Commentary for Niddah 127:1
<big><strong>גמ׳</strong></big> איתמר ראתה יום חמשה עשר לחדש זה ויום ט"ז לחדש זה ויום שבעה עשר לחדש זה
<b><i>GEMARA</i></b>. It was stated: If a woman observed a discharge on the fifteenth day of one month, on the sixteenth of the next month and on the seventeenth of the third month, Rab ruled: She has thereby established for herself a settled period in arithmetical progression,<span class="x" onmousemove="('comment',' Lit., 'in skipping'. The eighteenth day of the fourth month, the nineteenth of the fifth and so on are consequently forbidden days. ');"><sup>1</sup></span>
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