Commentary for Niddah 78:13

אשה קובעת לה וסת בתוך ימי נדותה ה"ד

is reckoned from the twenty-seventh day.<span class="x" onmousemove="('comment',' The day on which the discharge last appeared. The twenty-second day after the twenty-second is only the seventeenth day after the twenty-seventh (cf. prev. n. but five). ');">¹³</span>

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