Niddah

Menjamin of Saksanah was embarking on a journey  to the locality of Samuel where he intended to act  according to the ruling of Rab,  even where the woman had observed a discharge, assuming that Rab drew no distinction between one who did and one who did not observe a discharge, but he died while he was underway. Samuel accordingly applied to Rab  the Scriptural text, There shall no mischief befall the righteous. R. Hinena b. Shelemya observed: As soon as a person's teeth fall out  his means  of a livelihood are reduced; for it is said: And I also have given you cleanness of teeth  in all your cities, and want of bread in all your places. IF SHE OBSERVED A DISCHARGE WHILE SHE WAS STILL etc. Our Rabbis taught: If a girl observed a discharge while she was still in her father's house, Beth Hillel ruled: She is permitted marital intercourse all the night  and, moreover, she is allowed a full 'onah. And how long is a full 'onah?  — R. Simeon b. Gamaliel explained: A night and half a day. But do we require an 'onah to be so long?  Is not [such a requirement] rather incongruous with the following: If a person's winepresses or oil-presses were unclean and he desired to prepare his wine and oil respectively  in conditions of cleanness, how is he to proceed? He rinses the boards,  the twigs  and the troughs;