20 votes
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Does the Holy Ark weigh 4 tons?

I go through the math here. Admittedly I use a lot of very rough estimation. I caught some mistakes in my math in the video which I have edited here, as well as adding a section below regarding the ...
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  • 33.5k
11 votes
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Minimum amount of food for Beracha Rishona

While the Kol Bo (Siman 24) writes that such a small amount would not need a Beracha Rishona, and Rabbeinu Yonah (Brachot 27Rb) writes that for such small amounts every food gets the Beracha Rishona ...
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  • 95.6k
10 votes

The Chofetz Chaim's kiddush cup

I have heard the same rumour. I found the following by Rav Aviner. He was asked that whether the Kiddush cup of the Chafetz Chaim was like the measurement of Ha-Rav Chaim Naeh and not like that of the ...
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10 votes

Is the shiur called a "k'beiah" or a "k'beitzah"?

Yam Shel Shlomo in chapter 4 of Bava Kamma says to pronounce it beya as the other word is not nice. This is subsequently brought in the Magen Avraham in siman 156 which is probably where it picked up ...
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8 votes
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How far does dofen akuma stretch?

The Shulchan Aruch in סימן תרלב - דברים הפוסלים בסכך says: א סְכָךְ פָּסוּל, פּוֹסֵל בָּאֶמְצַע בְּד' טְפָחִים; אֲבָל פָּחוֹת מִד', כְּשֵׁרָה, וּמֻתָּר לִישַׁן תַּחְתָּיו מִן הַצַּד אֵינוֹ פּוֹסֵל ...
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8 votes

18 minute Matzah?

The 18 minute mark is almost certainly a mistake. The source of this time limit is from Pesaḥim 46a: Mishna: [Regarding] ‘deaf’ dough, if there is [a dough] similar to it which has become leaven, ...
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  • 9,701
7 votes

What is the absolute minimum length for peyos?

Taken from an article by Rabbi Aryeh Lebowitz: The Rambam (Avoda Zara 12:6) rules that one is only prohibited from removing peyos with a razor. Cutting peyos off with a scissor that provides a cut as ...
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7 votes
Accepted

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

They used a half of a lug of oil in each candle every night, in order that it would last through the longest night of the year (Menachos 88b). A lug is 6 egg volumes. An egg volume is disputed, but ...
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7 votes
Accepted

What is the hallachic definition of randomness?

I'd say if an average human, using an average human brain and eye, can't figure out the pattern, that's good enough. Rabbi Asher Weiss discusses the criteria of "does an unaided human notice it?" ...
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  • 127k
7 votes

The minimum amount of water a Sotah must drink

With regards to your first question, there is an opinion quoted in Sefer Habatim (Mitzvah 224) that holds that poison was actually added to the water and the miracle was not regarding the guilty sotah,...
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  • 39.8k
6 votes

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

The Chamudei Daniel has the famous opinion that for things that the Shulchan Aruch says "it becomes not kosher immediately", that means "if you don't pull them out immediately." More like a 2-second ...
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  • 127k
6 votes

3 Pesukim minimum per Aliyah

The Talmud states that this is to correspond to the three-fold division of Torah, Neviim, and Ketuvim: Megillah 24a הני ג' פסוקין כנגד מי אמר רב אסי כנגד תורה נביאים וכתובים What do these three ...
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  • 48.1k
6 votes

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

I found the following teshuvah by R. Betzalel Stern, BeTzel HaChochmah 2:16: Regarding someone who travels by airplane from Australia to Israel, and on the way flies over mountains and deserts......
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  • 13.8k
6 votes

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

Baer Heitev to Shulchan Aruch, Orach Chaim 210:1 writes: מכזית. כל האוכלין מצטרפין לכזית אכל חצי זית מז' המינין וחצי זית אחר מברך אחריהן בנ''ר.‏ All foods combine for a "כזית," (...
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  • 18.7k
6 votes

What to do with kiddush cups that are too small?

Because it was intended for a mitzvah I'd rather use it for a mitzvah if there is such an option. I've never heard of such a thing, as far as I recall. I've heard that it's nice to reuse something ...
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  • 73.2k
6 votes

Place the Menorah above 10 tefachim?

The Shevet Hakehasi 5:115:4 brings that the Chida (Machzik Bracha) was bothered by this postion of the Seder Hayom. The Shevet Hakehasi explains that this postion of the Seder Hayom can be reconciled ...
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  • 39.8k
6 votes
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How large was the menorah?

The Talmud says on Menachot 28b: אמר שמואל משמיה דסבא גובהה של מנורה שמנה עשר טפחים הרגלים והפרח ג' טפחים וטפחיים חלק וטפח שבו גביע וכפתור ופרח וטפחיים חלק וטפח כפתור ושני קנים יוצאין ממנו אחד אילך ...
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  • 46.9k
6 votes
Accepted

Is there a minimum field size for peah to apply?

This is the subject of a debate in Peah 3:6. The halachah follows R. Akiva’s opinion that there is no minimum size (Rambam Hilchot Matnot Aniyim 2:3).
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  • 38.5k
5 votes
Accepted

How much produce becomes bikkurim (first fruits)?

הבכורים אין להם שיעור מן התורה אבל מדבריהם צריך להפריש אחד מששים והרוצה לעשות כל שדהו בכורים עושהו:‏ The Bikkurim have no measurement from the Torah, but [the rabbis] required separating one ...
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  • 95.6k
5 votes
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How much of a gap in schach is acceptable?

Sukka 17a Mishnah: הרחיק את הסיכוך מן הדפנות שלשה טפחים פסולה בית שנפחת וסיכך על גביו אם יש מן הכותל לסיכוך ארבע אמות פסולה If the s'chach is distanced more than 3 handsbreadths from the walls then ...
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5 votes

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

The Temple Institute (מכון המקדש) is a Jerusalem-based organization whose goal is to build the Third Temple. As such, they have invested serious money into planning. (A visit to the visitor's center ...
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  • 22.8k
5 votes

What did they do for shiurim before modern measurements?

The Mishna in Keilim discusses this. Essentially they guessed it, based on the average measurement. Starting from Ch. 14:5, here are some of the measurements: פרק יז - משנה ה: הָרִמּוֹן שֶׁאָמְרוּ,...
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5 votes

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

Rav Feinhandler in his Sefer Avnei Yashfei 5:40 brings this exact case .He goes through the sources ,but I will write his psak ldinah. He holds("it seems") one should say al ahamchia and val haeitz, ...
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  • 39.8k
5 votes

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

As far as the "put it in front of a dog" test, I heard from a student of R' Y.B. Soloveitchik that he once said in a shiur that toothpaste is not chometz because it is not fit for dog-consumption, ...
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5 votes

Is ice considered food or drink in Halacha?

From Din Online: Poskim discuss the status of ice cream or ices–are they considered as liquids or solids? According to some poskim they are considered liquids, and would therefore be covered by ...
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5 votes
Accepted

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

The Gemara in Pesachim 46a (brought in the Rambam Laws of Chametz 5:13 and the Shulchan Arukh OC 459:2) says that if one leaves dough for the length of time that it takes to walk 1 "mil" (a Talmudic ...
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5 votes
Accepted

How much water could the tub Shlomo made hold?

In Eruvin 14b, the gemara asks this, and determines that the 2000 is a wet measurement and 3000 is dry, since dry goods can be heaped above the rim. לא סלקא דעתך דכתיב (מלכים א ז, כו) אלפים בת יכיל ...
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  • 22.8k
4 votes

What did they do for shiurim before modern measurements?

I heard the following from Rabbi Heinemann, in answering this question (specifically he was asked about R' Moshe's teshuva about the exact height necessary for a mechitza, which has a dearth of prior ...
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4 votes

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

According to this source, it may be a moot point. While Rambam claims that the Third Temple will be built by Moshiach, Rashi states that Hashem has already built the Temple in the heavenly realm and ...
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  • 1,574
4 votes

No mitzvah to wear tefillin every day?

Pri Megadim (Eshel Avraham 37:2) discusses whether the obligation is constant or daily. Rabbeinu Yonah (Iggeres Teshuva Ois 24) writes that one who doesn’t wear tefillin has close to 300 עונשים ...
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