measurements relating to the performance of different Mitzvot

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16
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2answers
166 views

Hagalah in Denver?

In high-altitude cities, water boils at a lower temperature than the standard 212 degrees Farenheit. For example, in Denver the boiling point is about 203 degrees. Can one kasher utensils with hagalah ...
14
votes
2answers
244 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 ...
13
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6answers
2k 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?
13
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4answers
714 views

Why do we say “You should live till 120”?

Prior to the Mabul people lived for hundreds of years. After the Mabul lifespans shortened although we see that the Avos lived in the 180 year range. In the Pasuk in Tehilim we say Yemei Shenoseinu ...
12
votes
1answer
135 views

Bracha after an earthquake

Per the Artscroll Siddur after an earthquake we make a Bracha "Oseh Maaseh Breishis". Up to how long after the earthquake can you make this Bracha? (sources please)
12
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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 ...
11
votes
2answers
392 views

Why does writing on Shabbos need two letters?

In order to transgress "writing" (כותב) on Shabbos, (m'd'oraysah) one must write two letters. (See for example here.) Why is this so? Shouldn't writing anything still be considered writing? For ...
11
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2answers
83 views

Why does Ezekiel describe the maneh as 20 + 25 + 10 + 5 shekels instead of just saying 60?

Ezekiel 45:12, in discussing just weights and measures, says: וְהַשֶּׁקֶל, עֶשְׂרִים גֵּרָה; עֶשְׂרִים שְׁקָלִים חֲמִשָּׁה וְעֶשְׂרִים שְׁקָלִים, עֲשָׂרָה וַחֲמִשָּׁה שֶׁקֶל--הַמָּנֶה, יִהְיֶה ...
11
votes
1answer
295 views

Kapparos on money - How much?

If one does the Minhag of Kapparos on money, how much money should be used for each person? (Sources.)
10
votes
1answer
197 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 ...
9
votes
3answers
209 views

Delaying using the toilet

According to Gemara Makkot 16b, the phrase in Vayikra 20:25 ... and do not make your souls disgusting - וְלֹא תְשַׁקְּצוּ אֶת נַפְשֹׁתֵיכֶם is a command not to hold in the urge to urinate or ...
9
votes
3answers
182 views

What is the Minimum Width of Tefillin Straps?

What is the minimum width of tefillin straps? For example: if one's tefillin straps partially tore, how much is required to remain for the tefillin to remain Kosher?
9
votes
1answer
762 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 ...
9
votes
2answers
318 views

The size/shape of biblical Israel

Based on this Tosafot in Bava Metzia 28a (D"H Chamisha Asar Yom), Eretz Israel is a square (400 sq. Parsah), and the distance between Jerusalem and the Jordan river is 1/39th the distance between ...
9
votes
0answers
182 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 ...
8
votes
3answers
1k views

Cash value of 'perutah'

How much is a 'perutah' worth in modern currency?
8
votes
3answers
458 views

Is human blood treif?

OK, I know it isn't kosher, but what is the shiur? And do we hold "chetzi shiur assur min haTorah"? For an application, what if you get a cut while hiking in the woods; is it assur to clean the wound ...
8
votes
2answers
183 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 ...
8
votes
1answer
98 views

Is there a minimum size for Chanuka flames?

Do the flames atop the chanukiya need to be a certain size to be valid? At the extreme, are tiny (but sustained) balls of blue flame sufficient?
8
votes
1answer
69 views

Are bushes acceptable for elevations that require a maakeh, a fence?

If evergreen bushes span the entire length of a side of a porch, at about waist-height for someone on the porch, do the bushes remove the need for a railing? The difference being that a railing can be ...
8
votes
2answers
83 views

Why 30 days of preparation for a חג

Why exactly 30 days to review the laws of the upcoming holidays? Is there anything about the number 30 that makes it significant?
8
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1answer
108 views

What's the Shiur of Mashehu?

Certain issurim (forbidden things) can become batel (halachically nullified) if they were unintentionally mixed in heter (permitted things). In order for this to happen, the heter must outnumber the ...
7
votes
5answers
323 views

K'zayis as a weight measurement

The label of the one-pound box of Cohen Halperin Shmura Matza reads: משקל כל מצה כשיעור כזית In English (with some Hebrew thrown in, in transliteration, of necessity), that's: The weight of ...
7
votes
2answers
558 views

Minimum Shi'ur for Kiddush on liquor

What is the minimum Shi'ur (volume) of a cup required for making Kiddush on liquor? Is there a smaller amount required than there is for wine? What is the minimum Shi'ur of the liquor that one is ...
7
votes
2answers
293 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
votes
1answer
135 views

Beis Shammai's dinar for kiddushin - philosophy?

The Mishna in Kiddushin (1:1) outlines a machlokes regarding the minimum amount of money necessary to effect kiddushin (i.e. create a marriage). According to Beis Hillel, the amount of money (or ...
7
votes
1answer
137 views

How high before a tree branch does not cause a problem for a Succah?

I have a lovely tree in the back yard, it must be 70-100 years old, maybe 15-20 feet around at the base. First branch is 32 feet up. I know since I used a 35 foot ladder to hang a swing from it, and ...
7
votes
1answer
204 views

How many rafters invalidate the sukkah?

From my understanding, the roof of a sukkah might consist of two components: rafters and schach. (Although it seems to me that often the rafters themselves are valid schach, I am under the ...
7
votes
1answer
180 views

What height porch requires a railing?

What are the different opinions of heights (in American or metric units) that requires a railing for the side of a porch?
6
votes
3answers
564 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 ...
6
votes
2answers
271 views

How many T'fachim make up an Ama?

Is it possible to convert between Torah measurements? Specifically, T'fachim & Amot, (cubits) so I can figure out the size of the luchot (tablets) within the Aron Hakodesh (ark). (The Luchot are ...
6
votes
3answers
179 views

When does counting 100 Brochos per day start and end?

There's a Halacha/Mitzvah to say at-least 100 Brochos a day. My question is: what does the term "day" mean in this regard. Does a day start at night, and end the following night (as is the case in ...
6
votes
1answer
153 views

Aruch Hashulchan's moon-distance estimate

Aruch Hashulchan, Orach Chayim 397:1, says that a מיל is the same as a Russian верста (verst) or 500 сажен (sazhen), which comes to 1066.8 meters. In 426:2, he says the distance to the moon is about ...
6
votes
2answers
141 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"?
6
votes
2answers
129 views

Within what time frame does one have to give maaser on a large sum?

If someone suddenly has a large sum of money from a lottery or inheritance or gift, how much time does one have to disperse maaser money from that?
6
votes
1answer
87 views

How does one do Hagalah above 12,000 feet?

How does one do Hagalah above 12,000 feet, where water's boiling point falls below 190°F? Under normal circumstances, the water will not be Rochsim, and therefore unsuitable for Hagalah. Using a ...
6
votes
1answer
194 views

No mitzvah to wear tefillin every day?

I heard that the Bet HaLevi and the Peri Megadim hold that there is no Mitzva for a person to don Tefilin everyday. Can someone source these opinions and explain exactly what they are meaning to say?
6
votes
1answer
219 views

How long until a bean chulent is totally cooked (mevushal kol tzorko)?

My son has started raiding the chulent Friday night. To be able to return the chulent crock pot back to the casing, everything must be fully cooked. I rarely cook with beans, but would like to try ...
6
votes
1answer
36 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 ...
5
votes
1answer
181 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 ...
5
votes
2answers
158 views

What is a source that allows one to treat one's house as all within four amos?

I am after a source that allows one to treat one's house as all within four amos l'chatchila, with respect to nagel vasser (hand washing in the morning).
5
votes
2answers
181 views

What is the proper length of the Tefilin Shel Rosh straps?

How long are the Tefilin Shel Rosh straps supposed to be? What is the minimum Shiur and what is the maximum?
5
votes
2answers
360 views

Challah Loaves on Shabbat have a minimum size?

In this article regarding the Shabbat Challah loaves, The Shmirat Shabbat KeHilchata (vol. II 55:5) is quoted as saying: The loaves must each be at least the size of an olive Normally, the size ...
5
votes
3answers
305 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
votes
2answers
148 views

Why is the right strap longer than the left strap by the Tefilin Shel Rosh?

What is the reason that the right strap is longer than the left strap by the Tefilin Shel Rosh?
5
votes
3answers
276 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? ...
5
votes
1answer
88 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 ...
5
votes
2answers
87 views

challah bracha on separate dough balls

I understand a bracha on dough is made if the amount of flour is greater than a certain amount, sourced here. I have a small food processor I use to knead the dough. I plan to make a bunch of dough ...
5
votes
3answers
157 views

Why are we required to light Chanukah lights only for about half an hour?

Since the miracle of the oil of Chanukah was that from one flask of oil they miraculously had enough oil for the menorah to burn all night for eight days, why did Chazal require us to light only for ...
5
votes
1answer
167 views

What is the source for the current Shiurim that we have?

There are generally two types of Shiurim, the "classic" type (R' Avrohom Chaim Noeh) which says that when we measure an Amah nowadays it is roughly the size of an Amah in the time of the Beis ...