Reference for Niddah 62:49
זה ממקום שנברא וזו ממקום שנבראת
SINCE THEY COHABIT WITH MENSTRUANTS BECAUSE [THEIR WIVES] CONTINUE [UNCLEAN FOR SEVEN DAYS] ON ACCOUNT OF A DISCHARGE OF ANY BLOOD.<span class="x" onmousemove="('comment',' Even blood that is clean. Should a discharge of clean blood on one day be followed by one of unclean on the following day, the Samaritan woman would count the seven days of uncleanness from the first day, regarding the second discharge as having occurred within the seven days of menstruation, so that on the eighth day she regards herself as clean, while as a matter of fact her uncleanness began on the second day and continues for seven days, the last of which is the eighth from the first discharge on which she is still menstrually unclean. ');"><sup>46</sup></span>