measurements relating to the performance of different Mitzvot

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1answer
92 views

(Tefach) Wide Gartel

Some use a very wide gartel. A friend of mine mentioned an inyan (Judaism-sourced idea) that the gartel should be wider than one tefach. Can someone source this inyan that the gartel should be (more ...
5
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2answers
104 views

How big can a mezuzah be?

I read in the news about an Israeli designer, Yaakov Merdinger, who created the world's largest mezuzah case. As you can see in the photo, the mezuzah case is bigger than the door. Is this kosher? ...
3
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1answer
77 views

What is the shiur Hanaah?

How much Hanaah (physical benefit) must one have of things prohibited as an Issur Hanaah (things forbidden for benefit) like milk and meat, Kiley HaKerem (certain grape mixtures), or Avoda Zara ...
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1answer
28 views

How far does one have to go into the ocean to say HaGomel?

When one goes "into" the sea, one is obligated to say HaGomel (see Berachos 54). How far does one have to go to be considered "in" the sea? If one goes swimming on the beach, does one say HaGomel? ...
3
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1answer
303 views

Which is the height considered 3 tefachim for not “praying in height”? (30cm?)

Recently we had to make a synagogue for one day at a hall, and we used a scaffold for the Shaliach tzibbur to be well heard by all the public. The Scaffold was 1m x 1.5m, and I don't remember the ...
1
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1answer
109 views

The Chofetz Chaim's kiddush cup

I read somewhere (don't remember where) that the Chofetz Chaim used a kiddush cup that was a smaller shiur than he recommends to use in his Mishna Berurah. Can anyone verify this and/or explain the ...
9
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2answers
1k views

18 minute Matzah?

Are there sources EXPLAINING why we have to make matzah within 18 minutes? I understand having a time limit if in fact the reason we eat matzah is to reenact the speed which we left Egypt (that ...
3
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2answers
100 views

How long does entire process of baking matzo take to be kosher?

If one would like to bake matzo or use flour to make a Passover food, how long do we have for the process to take place? If 18 min, then is that 18m59s or 18m00s? If the food is cooked before 18 ...
9
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1answer
210 views

What is the hallachic definition of randomness?

A new Shabbat-friendly technology, KosherSwitch, uses randomly timed light pulses to create various safeks, so that flipping the switch does not hallachically count as switching the light on, even in ...
7
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3answers
331 views

Saying 100 Berachoth in a day

What is the source for the idea that one should say 100 Berachoth in a day, and how serious of an obligation is this? Is it mandatory, is it laudatory, or is it merely a nice idea?
7
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1answer
152 views

Is ice considered food or drink in Halacha?

Is ice considered food or drink in Halacha? So for example, if one would eat an kezais of ice on yom Kippur, but it would not be equal to a reviyis, would he be liable for a chatas?
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1answer
35 views

Is there a concise book on how math and measurements are used in Torah and talmud?

Both the Torah and Gemarrah use math in various places, e.g. percentages (5ths (certain penalties); 10ths (ma'aser), etc.) They also use many terms of measurements - e.g. shekel = 20 gerah; numerous ...
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0answers
45 views

Can you carry an object from the step outside your house inside your house?

According to the laws of carrying on shabbos one may not carry from one domain to another aside from a makom petur ("exempt area"). A makom petur is less that 4X4 handbreadths and more than three ...
6
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2answers
177 views

Source for the concept of learning 1 hour on Shabbat is like 1000 during the week?

There is a Benayahu on Taanit 11a I think that may hint to this, but not clear enough. Is there an actual source for "1 hour learning on shabbat is like 1000 hours during the week"?
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1answer
75 views

Regarding chametz, what is considered “not fit to be eaten by a dog”?

Regarding whether something needs to be considered chametz or not, there is a general rule of ראוי לאכילת כלב - i.e. - if a dog wouldn't eat it, then it's not considered food and therefore it is not ...
10
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1answer
229 views

What are these three types of Amos?

I'm not one to usually go to Google itself to learn about Judaism, but I feel that the circumstances around how I discovered this is really intriguing... Google Maps has a nice little feature that ...
10
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1answer
206 views

Eating out Friday night of Chanukkah

If one is lighting Chanukkah candles inside (for whatever reason) relying on the publicization to himself and his family, then what should he do on Friday night if he is eating out? Must he make the ...
3
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3answers
96 views

Ad Dlo Yoda measurments

What are the many Halachic options of doing the Mitzvah of drinking on Purim please quote sources? Meaning what are the diffrent the definitions of ad Dlo Yoda?
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2answers
76 views

What was the volume of oil for one day's lighting of the Menorah?

Large jars for storing oil or wine were common in Judah. For 100’s of years, oil and wine were the commodities that were used to pay tribute and taxes. Many storage jars were standardized and may ...
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2answers
74 views

Where does the contemporary measurement of a Kezayit come from?

According to the Nodeh B'Yehuda and the Chazon Ish, in order to calculate the size of a kezayis (which apparently is based on the size of an egg), we must double the size of our contemporary eggs. ...
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6answers
3k views

Is a rare steak kosher?

If you have a steak medium to rare, such that it's still pink in the middle, is it kosher? At what point is meat cooked enough?
4
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2answers
91 views

Ending place of the Peya

It seems from my understanding of the Shulhan Aruch (Y"D 181:9) that the picture above is the Shiur of the Peya. However it seems like most people say it goes until the bone like the picture below. ...
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0answers
74 views

Would halachic units be shrunk if a person was (Honey, I Shrunk the Kids-style)?

In the classic move Honey, I Shrunk the Kids and its sequels, people get shrunk down to 1/264th of their normal size. So, a person is around 1/4 of an inch tall. If such a thing were even possible, ...
8
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2answers
77 views

What Bracha acharona on .5 kezayit of grapes eaten together with .5 kezayit of mezonot crackers?

What Bracha acharona on .5 kezayit of grapes eaten together with .5 kezayit of mezonot crackers? Do you say al hamichya ve'al haetz or is it boreh nefashot since neither is a kezayit? Please provide ...
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2answers
104 views

Measurements for the Bais HaMikdash — can we do it with a computer?

Since everything is computerized now, when the Bais HaMikdash is rebuilt, will we use the computer to rebuild? I.E., the measurements for the offerings, the entire rebuilding, etc.?
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1answer
68 views

What is the the amount a person who feels weak on a fast day could eat or drink?

What is the the amount a person who feels weak on a fast day could eat or drink. How many ounces and how often?
6
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1answer
39 views

Menorah 20 Amos above ground level

One does not fulfill his or her obligation of lighting the menorah if it is 20 Amos above since it is not easily seen. The Rambam in Hilchos Shabbas 17:15 writes that a beam over a mavoi with ...
4
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1answer
48 views

Do brachos on seeing have to be made within four amos?

Is there any source that says that in order to make a bracha for seeing e.g., a sage of Israel, a sage of the nations, or an unusual animal, one must be within four amos of the person/thing? I found ...
6
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3answers
739 views

What is the absolute minimum length for peyos?

I have often heard that 1/4th of an inch is the minimum length of the hairs in the peyos area. For example, that is mentioned in an answer to a previous question: How to advise your barber My ...
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0answers
42 views

How big can a chanukia get?

I recently saw this story about students at YU who lit up their dorm windows to turn the entire building into a giant chanukia (just the form, not a real one). That inspired a question: Exactly how ...
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2answers
90 views

What did they do for shiurim before modern measurements?

In recent centuries, authorities such as the Chazon Ish, Rabbi Chaim Na'eh, and Rabbi Moshe Feinstein ruled on the exact size of a tefach, ammah, kezayit, and other shiurim. What did people do before ...
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59 views

Has there been a discussion of changing the maximum height in halacha?

In halacha certain things are considered invalid because the exceed the maximum height which people will notice, 20 amos (menorah, sukkah, korah). In modern times many (most?) people live in areas ...
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2answers
201 views

What is the source for washing Mayim Acharonim with only a few drops of water?

OC 181 (4) MB [10] says that when washing mayim acharonim one must wash up to the second knuckle and using a few drops does not fulfill the mitzvah at all. Shulchan Oruch HaRav 181 (4) says there is ...
4
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2answers
153 views

Measurements used in Halacha

What is the underlying argument between the Chazon Ish and Rabbi Chaim Naaeh and Reb Moshe Feinstein? I know they argue in amounts, but what is the underlying argument? How did each get the ...
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0answers
39 views

What's the definition of “not now” for priority-of-b'racha purposes?

Orach Chayim 211 is about what food to recite a blessing over (that is, and eat) first when one wishes to eat two foods. It's clear that (except according to the Rambam cited in 211:2) one does not ...
4
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1answer
67 views

Is there a legal minimum on the amount of soil needed to make a suitable grave?

This is not being asked for any pragmatic need. I had the thought about people living off of planets. Without getting into the issue of whether a burial can take place anywhere beside Earth, I ...
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3answers
1k views

Is there a “5 second rule” for foods becoming non-Kosher?

OK so I don't actually mean a 5 second rule. But is there an amount of time that it takes for something hot that comes in contact with a non-Kosher utensil or surface to become not kosher? For ...
4
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0answers
45 views

Must the entire decoration be within 4 t'fachim of the schach?

Inspired by Can too many decorations render a sukkah invalid? If there is a big decoration hanging from the schach, is it OK as long as the top (part, or most of the decoration) is within 4 tefachim, ...
5
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3answers
339 views

Is there a time limit for Borei Nefashos and Beracha Me'en Shalosh?

It seems that there's a 72-minute period after eating in which one must bentch. Does this also apply for Borei Nefashos and Beracha Me'en Shalosh?
5
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1answer
94 views

How much of a gap in schach is acceptable?

How large of a gap is allowed in a sukkah's schach (roof) without invalidating it? (in tefachim and inches/feet, if possible) Would it make a difference if the gap was in the middle of the roof, or ...
2
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1answer
22 views

How much invalid material invalidates schach?

How much invalid material invalidates schach? (tefachim + inches preferred, but not required) Would it make a difference if this material was in the middle of the roof, or on the side (=next to the ...
5
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3answers
283 views

Sechach supported partially by metal

For those who are careful to only support their sechach on sechach-eligible materials, how much does it matter if a small amount of the sechach inadvertently rests on non-sechach-eligible materials? ...
4
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2answers
74 views

How far does dofen akuma stretch?

After reading Is a covered sukkah wall counted as a wall? i had a followup question on the answer there. (I was actually going to ask that, and had even drawn up diagrams, only to find that it was ...
2
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1answer
71 views

L'Hafrish Challah with Dough Made by Multiple Women?

I am wondering if small portions of dough, made by separate women in a challah baking class (thus each small portion would be owned by a single woman), can be combined to create the requisite amount ...
5
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1answer
201 views

What is the shiur for anointing on Yom Kippur?

Is there a minimum shiur to be chayav (liable) for anointing on Yom Kippur, and, if so, what is it? The gemarah (Yoma 76b) seems to learn it out as a comparison to food consumption: would that mean it ...
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1answer
51 views

How much produce becomes bikkurim (first fruits)?

How much produce becomes bikkurim (first fruits)? Rambam says: Hilchos Bikkurim Chap 2 Halacha 19 How should one separate the first fruits? A person descends to his field, sees a fig tree, a ...
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2answers
268 views

How big, and what exactly, is “Kedei Kelipah”?

{Kedei Kelipah is a term used in Kashruth for the amount of something that needs to be removed in order to allow one to treat the remnant as Kosher. (This only applies under certain conditions, which ...
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1answer
79 views

Washing Once or Twice

Someone told me that technically one needs to pour water on each hand only once since we use large quantities of water. Is there a halachic source for this? I heard that the requirement to pour twice ...
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1answer
153 views

Satmar Rebbe's opinion on Mechitza

Where could I find the opinion of the Satmar Rebbe (Rav Yoel) zt'l on the height and laws pertaining to the Mechitzah?
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1answer
119 views

Soldier's Shovel

Is there a shiur for the item the soldier is obligated to carry in Devarim 23:14? וְיָתֵד תִּהְיֶה לְךָ עַל אֲזֵנֶךָ וְהָיָה בְּשִׁבְתְּךָ חוּץ וְחָפַרְתָּה בָהּ וְשַׁבְתָּ וְכִסִּיתָ אֶת צֵאָתֶךָ ...