Reference for Niddah 59:10

דלפני תשמיש קחשיב דלאחר תשמיש לא קחשיב

made her appearance before us at twilight,<span class="x" onmousemove="('comment',' Of the day preceding the one from which the counting begins. As twilight is a time of doubtful day and doubtful night it cannot be definitely regarded as either. ');">¹⁰</span>

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