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One is permitted to make calculations concerning a Mitzvah on Shabbos.
One is permitted to pledge money to charity on Shabbos. (1)
One is permitted to discuss, on Shabbos, Shiduchim, and to make arrangements to teach a child Torah or an occupation. (2)
A wedding may not be held on Motza'i Shabbos because of the concern that they will forget that it is Shabbos and will slaughter a bird in preparation for the wedding.
A Besulah marries on Wednesday and has the Bi'as Mitzvah on Thursday, because it is the day of Creation on which Hashem blessed the fish.
A widow marries on Thursday and has the Bi'ah on Friday, because it is the day of Creation on which Hashem blessed Adam and Chavah. (3)
The deeds of the righteous are greater than the Creation of the world.
A person should put his finger in his ear to avoid hearing something improper.
Hashem made the earlobe soft so that it could be folded up and inserted into the ear to prevent one from hearing something improper.
A person should not listen to idle chatter, because the ear is the quickest to burn of all the limbs.
It is questionable whether the blood of Besulim is attached to the rest of the blood flow or not.
Rebbi Shimon: An unintentional act of a Melachah is permitted on Shabbos. Rebbi Yehudah: It is not permitted.
Rebbi Yehudah: One who causes a wound on Shabbos which is Mekalkel (a destructive act) is exempt. (4)
A BIT MORE
1. One is permitted to discuss, on Shabbos, matters that pertain to the public welfare and to saving a life.
2. Teaching a child an occupation is a Mitzvah.
3. Alternatively, a widow marries on Thursday and has the Bi'ah on Friday in order to give her three days to spend with her new husband.
4. Rebbi Shimon: One who causes a wound on Shabbos that is Mekalkel (a destructive act) is Chayav if it was an intentional act.
THE PROHIBITION AGAINST IDLE CHATTER
A person should not listen to idle chatter, because the ear is the quickest to burn of all the limbs. The Torah warns us not to listen to idle talk even if no forbidden subjects are being discussed. We do not find that the Torah warns us similarly about the usage of any of our other senses, such as sight (the Torah does not warn us not to look idly at things that are permitted). Why is listening to idle talk an exception? The Maharsha explains that the prohibition is because we must be more careful with our sense of hearing than with our other senses, because when someone is discussing idle topics it easily could lead to subjects that are prohibited. That is the meaning of the Gemara that the ear is the quickest to burn. It is the quickest to burn because it is so easy to transgress the prohibition of listening to forbidden topics, and therefore the ear is the most likeliest limb to suffer from the fire of Gehinom.
MARRIAGE ON EREV SHABBOS
According to some opinions it is forbidden to get married on Erev Shabbos and on Motza'i Shabbos because of a Gezeirah that it might lead to Chilul Shabbos (by way of preparing for the wedding on Shabbos). However, some opinions permit marrying on those days, and the Minhag is to get married on Friday as long as the meal was prepared for three days in advance. (Shulchan Aruch EH 64:3)
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