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13
votes
1answer
152 views

Can an ultrasound be relied upon?

I have read reports of the accuracy of gender prediction from an ultrasound with numbers ranging from 90-98%. There is a halacha (Y.D. 194:11) that if a fetus sticks its hand [or possibly any limb] ...
5
votes
1answer
196 views

Notched 2x4 for maamid?

Let's assume that there is a lechatchila to not use metal object that are mekabel tumah (susceptible to tumah) for something that supports the s'chach ("maamid"), which can be avoided by using ...
3
votes
1answer
59 views

The Impurity of Teeth

In Bemidbar 19:16, the Torah mentions impurity conveyed by a person's bone. From this, the gemara learns out that those parts of a corpse that convey impurity are those parts that are like a bone in ...
2
votes
1answer
36 views

Why does the atonement for impurity in the Temple take so many different forms?

Background The Torah forbids entering the mikdash or eating the meat of a korban in a state of impurity (so-called טומאת מקדש וקדשיו) . Someone who transgresses in error (beshogeg) gets forgiveness ...
1
vote
1answer
76 views

How does Tum'ah (“Ritual Impurity”) work?

What are the mechanics by which Tum'ah works? How does one detect it, or diagnose someone as Tamei? Certain materials can contract and transfer Tum'ah. Why do these material do so, but others don't?...
9
votes
0answers
86 views

Post mortem Tahara

I'm looking for sources discussing the religious aspect of the Tahara done on deceased Jews. I recall someone mentioning that the religious aspect of it was a practice we picked up from the Muslims ...
6
votes
0answers
68 views

Must hand washing be done with pure (fresh) water?

It seems from here both that some types of water are considered too salty to be acceptable for ritual handwashing and that mikvah water is always considered acceptable. I am left wondering what, ...
6
votes
0answers
74 views

Beam for s'chach with wood glue + embedded screws

Let's assume that there is a lechatchila to not use metal object that are mekabel tumah (susceptible to tumah) for something that supports the s'chach ("maamid"), which can be avoided by using ...
5
votes
0answers
70 views

Why was the oil in the temple tamei at all?

Regarding the story of Chanukah and the need for tahor oil, I recall hearing in a shiur one time that there are 4 things which are not susceptible to tumah from the Torah; oil (a subset of mashkin) ...
5
votes
0answers
110 views

Blessing on Immersing Vessels to Purify Them

A Mikvah can be used to purify humans or certain vessels which have contracted ritual impurity (Rambam Mikvaot 1 (English)). When humans use the Mikvah to purify themselves they recite a blessing (...
5
votes
0answers
57 views

Tourist guides for Kohanim

I recently saw a tourist guide for Kohanim, published online by the Chicago Rabbinical Council, listing certain Chicago tourist sites that are, and are not, problematic for Kohanim. Are there any ...
5
votes
0answers
117 views

Putting poison inside bamboo rods (s'chach)

It says in Shulchan Aruch (OC Siman 629 Sif 3) that one may cover a Sukkah with "chitzim" (arrows) that don't have a "beis kibbul." However, if they do have a "beis kibbul," then it's not valid for ...
4
votes
0answers
72 views

What are the Tumah implications outside of Temple?

What are the implication of tumah other than related to the Temple? E.g., a pathologist in, say, Australia is contaminated with Tumas Mes all the time. Does he have to travel to Jerusalem to get ...
3
votes
0answers
21 views

Using a robot “puppet” for matters requiring purity

Based upon an exchange in this question, we require complete purity in the drawing of water for the purposes of mei chatas. The setup described in Maseches Parah was essentially a ritualistic clean ...
2
votes
0answers
35 views

Kohanim in Eastern Europe

Another question on this website deals with the issue of kohanim in Auschwitz. To be "strict", a kohen today could simply avoid going to death camps altogether. Elsewhere, however, is not so easy. Are ...
2
votes
0answers
75 views

Tahor and Tamei

Tahor and Tamei are often translated as clean and unclean or (ritually) pure and impure. But what exactly do they mean, what are the definitions for tahor and tamei? How does one render "ritually" ...
1
vote
0answers
42 views

When does טומאת הסגר begin?

When the Chumash speaks about a kohen's seeing some tzaraas on a person's body for the first time, it says the kohen "shall defile" (Vayikra 13:3, 13:11, 13:20, 13:25, 13:30, 13:44). Rashi (13:3) ...
1
vote
0answers
42 views

רש״י's use of the קל וחומר after it's been discredited (שבת כו ע״ב)‎

The Bavli, Shabas 26 amud 2, derives from some wording in Vayikra that a three-finger-by-three-finger piece of wool or linen fabric can become tame. It then proposes that the verse teaches us only ...
1
vote
0answers
86 views

Why make the Kohen burning the Para Aduma rabbinically impure?

The Gemara says that we make the Kohen burning the Para Aduma (the red heifer) impure and then dip him in the Mikva. The reason given is that there is an argument between the Rabbis and the Sadducees ...
0
votes
0answers
29 views

If one has tzaraat but doesn't seek a Kohen

In parashat Tazria it mentions the Kohen's involvement of identifying tzaraat and rendering the person pure/impure (about 50 times!). Rashi (13:3) says that the Kohen's involvement in declaring 'pure\...
0
votes
0answers
19 views

Does someone that incurs guilt that is hidden from him incurs this forever?

Vayikra 5:2 teaches that if a nefesh touch anything tamei, carcasses from animals that died a natural dead for example, and it is hidden from him, he also shall be tamei and incurs guilt. .. (verse ...
0
votes
0answers
59 views

Examining the Zav

Does anyone know of any rabbinic sources (Talmudic/midrashic) that indicate that a Zav would go to a halakhic authority to be examined regarding his Zivah?