Yoreh De’ah

29 08, 2022

Mezuzah on Permanently Closed Door

August 29th, 2022|Mezuzah, Sefer Torah, Tefillin, Mezuzah, Shulchan Arukh, Yoreh De'ah|



In a new apartment a door between two rooms doesn’t open and will remain shut. Even if the door could be opened, there will be furniture on one side of the door. Does the door need a mezuzah?


I assume at one time it was made to open and it still has the door frame. If that is the case, some say it does still require a mezuzah. The issue is how you distinguish between the case of Shulchan Arukh and the case of Rema in Shulchan Arukh YD 286:18

בית שיש לו פתחים הרבה, אף על פי שאינו רגיל […]

19 08, 2022

Aveil Serving as Shaliach Tzibur

August 19th, 2022|Aveilut, Shulchan Arukh, Tefillah, Yoreh De'ah|



There are not a lot of people in our community who can serve as Shaliach Tzibur on Shabbat. We want Shlichei Tzibur who can uplift the kehillah with singing and proper nusach. Under these circumstances, it is permissible for an aveil to serve Shaliach Tzibur?


It is permitted. Even Rema (YD 376:4) who rules that an aveil not to be a shaliach tzibur on Shabbat and Yom Tov

אבל לא נהגו להתפלל בשבת ויום טוב, אף על פי שאין איסור בדבר

makes it clear that it is a minhag and not technically an issur. And poskim thus make exceptions when necessary.

The […]

21 06, 2021

Accidentally Cooked Possible Dairy in a Meat Air Fryer

June 21st, 2021|Kashrut, Yoreh De'ah|


Riverdale, NY

A nanny accidentally used an air fryer, which is fleishig, to cook fish sticks. The fish sticks are Tablet K-D, and there is a food warning label about milk on the package. There is no milk in the ingredients, but in the “contains less than 2% of the following” ingredients listing, “whey” is included. What is the status of air fryer?


Let’s first assume that the  fish sticks were on aluminum foil or in a pan. There is a debate if whey is milk mide’orayta or only miderabanan. See Shulchan Arukh YD 87:6, 8. I also assume that a “D” […]

13 06, 2021

May an Aveil Purchase a New Car? Can someone do so during the 3 weeks?

June 13th, 2021|Aveilut, Berakhot, Orach Chayim, Tisha B'Av - 3 Weeks, Yoreh De'ah|


Chicago, IL

A man in aveilut needs a new car. The old car the family has used is breaking down more and more frequently. Is this something that should wait another 10-12 months? What if his wife purchased the car and recites שהחינו? Would the halakha be the same during the 3 weeks?


The practice of not saying shehecheyanu is recorded in the case of the 3 weeks (Shulchan Arukh OC 551:17). Poskim explicitly state that this does not apply to a mourner. See Magen Avraham OC 551:42 and Mishnah Berurah 551:98. The reason is that the problem with shehecheyanu is not the simchah per se, […]

11 06, 2021

Do Reused Glass Bottles Require Tevilah?

June 11th, 2021|Yoreh De'ah|


Philadelphia, PA

Rav Linzer, if a kosher winery wishes to reuse bottles, would they have to tovel them at any point?


Rav Moshe (Iggrot Moshe YD 2:40) has a brilliant teshuva that if a person takes glass jar, which is generally disposed of, and decides to use it permanently it still does not need tevilah. This is because it was made a halakhic jar by the Jew when he decided to reuse it. Before this point it wasn’t considered a keli, so the keli was made by a Jew.

If these bottles are generally disposable or recyclable for their glass, and not made […]

27 05, 2021

Status of Keilim Used With Tablet-K Cheese

May 27th, 2021|Kashrut, Yoreh De'ah|


Riverdale, NY

Dear Rabbi Linzer,

You previously addressed the the satus of  keilim after making macaroni and cheese with non-hekhshered butter. I’d like to ask a similar question with regard to a keli in which one cooked with Tablet-K cheese. I am assuming one does not rely on Rabbeinu Tam’s leniency, particularly given the Rema’s position in YD 115:1 that gevinat akum makes keilim prohibited. What if one is a roommate and the keilim belong to someone else? Assuming that any new food cooked in those keilim (which are no longer ben yomo) uses cheese with a proper hashgachah, can one consider that bedieved and kosher (based on Taz YD 115:12) if […]

10 05, 2021

Does a Dammed River Have the Status of a Mikveh?

May 10th, 2021|Niddah, Yoreh De'ah|


Philadelphia, PA

Can a lake that was created by damming up a river be used as a keilim mikveh? The dam is that straight line at the bottom of the lake. The lake in question is called “Henion Pond.” You can see the two rivers/streams that lead into it.



First, there is no difference between the requirements for a keilim mikveh and one for a niddah, other than a keilim mikveh does not need 40 se’ah if we are dealing with מעיין (not rain water). In such a case, a keilim mikveh needs just enough to fully cover the keli. […]

9 05, 2021

Ending Shivah on Shabbat Before Shacharit

May 9th, 2021|Aveilut, Yoreh De'ah|


Midwest, USA

When shivah ends on Shabbat, does it end when Shacharit ends on Shabbat or the time Shacharit would have ended if it were a weekday? Since we’re talking about a community in which people do not pay shivah calls on Shabbat, should we go by the time that services end on weekdays? If so, if we start start davening on Shabbat after we normally finish davening during the week, could someone whose last day of shivah was Shabbat receive an aliyah in shul?


As you note, Rema rules in Shulchan Arukh YD 395:1 that even if מנחמים don’t usually come on day 7 (which, as the poskim note, […]

9 05, 2021

Day of Brit When Father’s and Doctor’s Time Conflict

May 9th, 2021|Milah, Yoreh De'ah|


Washington, D.C.

A baby boy was born Wednesday night. Sunset was 8:04. The father initially thought he was born at 8:06, however, the birth certificate says 7:58. Does this qualify as a safeik?


In such a case we would follow the doctor’s recording of the time and rule that the birth occurred on Wednesday before sunset, and the brit will be on the following Wednesday.

To understand why, we have to consider two scenarios:

  1. The most likely scenario is that the father’s time is not the moment of halakhic birth. According to halakha, the halakhic time of birth is when the majority of […]
2 05, 2021

Bedikah For a Women With a Longer Than Average Period

May 2nd, 2021|Niddah, Yoreh De'ah|


Midwest, USA

Is there a process the Rosh yeshiva recommends for women who regularly take until day 7/8/9 to get a clean hefseik? I’m not talking about women who didn’t understand leniencies around brown and now that we look at their bedikot we can tell them otherwise. I mean women who are regularly seeing red on bedikot until those days. Would you recommend doing everything they can to get a clean hefseik (cleaning, etc.) and if they can get it, then skipping the bedikot during the first several days of 7 nekiyim (and colored underwear of course), or is this not an option? […]

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