Reference for Niddah 137:22

לא צריכא כגון דלא בדקה עד שביעי ואשמועינן התם תחלתן אע"פ שאין סופן והכא קמ"ל סופן אע"פ שאין תחלתן

Said R. Shesheth to R. Jeremiah b. Abba: Did then Rab pronounce his ruling in agreement with the view of the Samaritans who ruled that the day on which a woman ceases to have her discharge may be counted by her in the number of the prescribed seven days?<span class="x" onmousemove="('comment',' Supra 33a. ');">¹⁶</span>

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