More Discussions for this daf
1. Nidah 2. Prohibition of One Onah Before the Veses
DAF DISCUSSIONS - SHEVUOS 18

Pesach Feldman asks:

Regarding the Or Zaru'a's stringency to forbid a person to his wife one Onah before her Veses, the Bach (YD 184 DH v'Nir'eh) writes the following: "The Or Zaru'a means to say that even though the Halachah follows R. Yehudah, it is proper to be stringent like the simple reading of R. Yirmeyah's ruling. Thus we forbid the previous Onah lest the woman see blood at the end of the night and think that it was the beginning of the day, or vice-versa."

I understand how forbidding the Onah before the Veses helps for vice-versa, but not how it help for the first case he mentioned, when she sees at the beginning of the day but thinks that it is the end of the night. Even if we forbid the Onah before the Veses, she may have Bi'ah during her true Veses due to her mistake!

Pesach Feldman, Yerushalayim

The Kollel replies:

See the Bach (DH Kasav ha'Ra'avad) who says that in the case of a woman who saw blood at Hanetz, and she is not sure if it started at the end of the night or at the beginning of the day, that they should observe both Onos -- the night and the day (not the like the Ra'avad and the Shulchan Aruch YD 184:4 who are lenient and say that she only has to observe the daytime Onah). He implies there that the Onah of the Or Zaru'a is a Seyag to this Din. In other words, a couple should accustom themselves to always keep two Onos as a Seyag and Geder to the case where the woman sees at Hanetz and me'Ikar ha'Din (according to the Bach) they must observe two Onos.

For more clarity: taking the Bach's statement that you quote, "Thus we forbid the previous Onah lest the woman see blood at the end of the night and think that it was the beginning of the day, or vice-versa," we would understand it the following way. In a normal Re'iyah (where there is no Safek in which Onah it falls) we forbid the previous Onah lest the woman happen to have a Re'iyah at Hanetz and not know whether it started at night or during the day, in which case she must certainly keep both Onos. (According to the Bach's understanding of the Or Zaru'a it would seem to have been theoretically possible to add on the Onah that follows the Onah of her Re'iyah instead of the previous Onah because the main thing is just that they be accustomed to keeping two Onos.)

Kesivah v'Chasimah Tovah,

Yonasan Sigler

This is not a Psak Halachah