Nishmat's Women’s Health and HalachaIn memory of Chaya Mirel bat R' Avraham

  • Hebrew
  • English
  • Espnaol
  • Francais
  • donate
Side Bar

Or Zarua

22 December, 2010



I didn't find this information anywhere on your site regarding Ohr Zarua. Is this the correct way to keep Ohr Zarua?

  1. the preceding onah of Yom HaChodesh (regardless if Yom HaChodesh is during day or night)
  2. The preceding onah of onah benonit ONLY if the last menstruation began during the night.
  3. The preceeding onah of Veset Haflagah (regardless if during day or night).


Do women still go to the mikvah if their Ohr Zarua onah falls on mikvah night?

Thank you:


There is debate about how to keep the Or Zarua's onah.  For example, many poskim who hold by onat Or Zarua do not expect a woman to observe onat Or Zarua for veset hachodesh or veset haflagah that are not kavua

Our understanding of common practice is:

1) To observe the onah preceding the veset hachodesh, day or night.

2) To observe the onah preceding the onah beinonit.  If she last became niddah at night, this would be the daytime before. If she last became niddah during the day, this would be the night before.

Some couples observe a full 24 hours (night followed by day) for onah beinonit. For such couples, if the woman last became niddah during the day, the onat Or Zarua would overlap with the night onah she is keeping as part of the 24 hours.

Some couples keep both the 30th and 31st days as onah beinonit. Such couples observe the onat Or Zarua only for the 30th day.

3) To observe the onah preceding the veset haflagah, day or night.

4) A woman does immerse and have relations when her onat Or Zarua falls on mikveh night.  In this case, she should perform a bedikah prior to relations.

This internet service does not preclude, override or replace the psak of any rabbinical authority. It is the responsibility of the questioner to inform us of any previous consultation or ruling. As even slight variation in circumstances may have Halachic consequences, views expressed concerning one case may not be applied to other, seemingly similar cases. All health and health-related information contained within Nishmat's Women's Health & Halacha Web site is intended to be general in nature and should not be used as a substitute for consulting with your health care professional. The advice is intended to offer a basis for individuals to discuss their medical condition with their health care provider but not individual advice. Although every effort is made to ensure that the material within Nishmat's Women's Health & Halacha Web site is accurate and timely, it is provided for the convenience of the Web site user but should not be considered official. Advice for actual medical practice should be obtained from a licensed health care professional.

For further questions or comments: 

The Nishmat Women's Health and Halacha Site is a public service of Nishmat, The Jeanie Schottenstein Center for Advanced Torah Study for Women. This project and others like it are made possible by contributions from people like you. If you have benefited from the service, and wish to enable us to help others, click here to donate.

Users of Internet filtering services: This site discusses sensitive subjects that some services filter without visual indication. A page that appears 100% complete might actually be missing critical Jewish-law or medical information. To ensure that you view the pages accurately, ask the filtering service to whitelist all pages under

Accessibility Toolbar