measurements relating to the performance of different Mitzvot

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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 ...
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995 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 ...
2
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1answer
19 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 ...
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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 ...
2
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1answer
43 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 ...
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43 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, ...
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2answers
68 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 ...
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1answer
37 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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70 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
56 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 ...
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1answer
57 views

What beracha acharona when ikar less than kezayit?

If you have an ikar (main) and tofel (secondary) mixture where the ikar is less than a kizayit but the entire mixture is greater than a kizayit, do you still make a beracha acharona on the ikar? Or ...
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27 views

Source for dying upon reaching a set number of words spoken [duplicate]

If I recall correctly, it says somewhere that we each have a predefined number of words to speak, after which we die. (The idea being that one should be careful not to speak unnecessarily.) Assuming ...
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31 views

How much Matzo must one eat on Pesach?

According to the OU, one must eat a minimum of "approximately 26 cubic centimeters" of Matza and Marror to fulfill his requirement (ie, a kezayis is 26 cm3). They also provide a chart, which states ...
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1answer
42 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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45 views

the measurements of Noah's arc and the arc of the covenent

The volume of Noah's Ark is 450,000 cubic cubits. The volume of the Ark of the Covenant is 5.625. Noah's Ark was thus exactly 80,000 times larger than the Ark of the Covenant. Is it significant that ...
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1answer
175 views

How many Oreos in a kezayis?

For standard Oreo cookies, how many would be a kezayis by volume? I have heard maybe 2.5 or maybe 3.
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1answer
85 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 ...
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1answer
107 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 ...
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2answers
101 views

Kaddish yatom: what if a parent really *is* wicked?

I understand that a soul may be judged for a full 12 months after death but that we (generally) only say kaddish yatom for a parent for 11 months because the longest period is for the worst sinners ...
4
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3answers
138 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 ...
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86 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 ...
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51 views

How is a ten tefachim wall hard to use?

The Gemara in Eiruvin 77a says that when a ten tefachim wall is between two courtyards, but is less than that to one courtyard (the floor of the courtyard is heigher), we give it to the one which is ...
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1answer
106 views

how much water do you need for a Netilat Yadayim

When washing your hands for Netilat Yadayim, how much water do you need for Netilat Yadayim?
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1answer
93 views

Shiur for kiddush rabba mezonos

When we make kiddush rabba with mezonos before having a real meal with bread, is there a shiur for how much mezonos a person should eat in order for it to be yotzei kiddush? Does it matter whether the ...
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48 views

3 Pesukim minimum per Aliyah

Why is it that each aliyah for Krias Hatorah has to be 3 pesukim at minimum? I know that the minimum for an entire krias Hatorah on a weekday is 10 pesukim (with the exception of Purim being 9 ...
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1answer
120 views

How long does it take to become a kofer?

If a person for whatever reason momentarily has a thought which denies God, but then afterwards reaffirms his belief in Hashem, is that an act of kefira? Does a momentary lapse in belief constitute a ...
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1answer
270 views

Which shita are those wearing extra long tallit katan following?

Some rabbonim are wearing really long and large talith katan. For example Rav Shmuel Auerbach shlita (picture below). Rav Elyashiv ztl used to wear a very long one too. Which shita are they ...
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1answer
63 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 ...
3
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1answer
32 views

Is there a concept of giving a fatter sacrifice?

Is there a concept of giving a fatter sacrifice as opposed to a smaller one? I believe the Torah says there are different levels of sacrifices depending on your wealth (e.g. a cow vs. a bird vs. ...
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215 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 ...
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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 ...
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145 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
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 ...
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96 views

Can we really estimate halachic distances?

A mishna on Eiruvin 41b tells of a ship that was coming into harbor at dusk coming into Shabbat. Since Shabbat had already begun when the ship docked, those on board asked R. Gamaliel if they could ...
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116 views

Shiur of “Miut Hamatzui”

A "miut hamatzui" is a phrased used to express a case where because of a small concern that something exists, or might happened, or does happen that the halacha is affected by this. An example is if ...
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1answer
57 views

Challah dough that loses its amount

A theoretical question: Someone was making a dough and in the process a large piece fell out from the mixture onto the floor. They had made exactly the right amount in order to take challah with a ...
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1answer
68 views

Violating the prohibition of wearing Sha'atnez

When does one become liable for wearing Sha'atnez? Is it merely putting the garment on one's body? Is it when the act of dressing is complete (ie., buttoning the last button, zipping up the zipper, ...
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2answers
492 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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124 views

What's the Source for Jerusalem and Sepphoris Having Larger Measuring Units?

In Rabbi Pinchas Kehati's introduction to Masekhet Challah, and again in his commentary on Eduyyot 1:2, reference is made to the adjusting of measurements when the Jews "arrived at" Jerusalem, and ...
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1answer
59 views

How many calories are in a KeZayith of flour?

I've often wondered how I can be sure I've eaten a KeZayith of flour when I eat something small but complete - like one cookie - and struggle with the decision of whether or not to eat more in order ...
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84 views

A shorter person with a normal sized tallis katan

A theoretical question: If a young person (a boy for example that is 13 yrs old) that happens to be very short (not because of any physical disability) wears a normal size tallis katan it will be very ...
2
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1answer
77 views

Bentching Ha-Gommel after a Birth

After a woman gives birth many have the custom of reciting the blessing of "ha-gommel" (a blessing of Thanks.) Until how long after a birth may this blessing by recited? (i.e. can it be said even a ...
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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 ...
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294 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.)
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233 views

How obligated is one to say Kaddish for a deceased relative?

People often talk about an obligation -- Chiyuv -- to recite Kaddish at every opportunity for some time after the death of a relative. (Which relatives are obligated and for how long does not seem ...
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204 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 ...
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359 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 ...
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1answer
134 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 ...
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2answers
482 views

Upper limits of “kovea itim”

It is known from the gemara (Shabbos 31a and cited in maamar Toras HaBayis ch. 1, among other places) that when a person dies, he is asked if he had set times for learning. I know that these times can ...
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81 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 ...