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Shabbat or the Sabbath, also called Shabbos by Ashkenazim, is Judaism's day of rest on the seventh day of the week—i.e., Saturday. On this day, religious Jews remember the biblical stories describing the creation of the heaven and earth in six days and the redemption from slavery and The Exodus from Egypt, and look forward to a future Messianic Age. Since the Jewish religious calendar counts days from sunset to sunset, Shabbat begins in the evening of what on the civil calendar is Friday.
Kiddush, literally, "sanctification", is a blessing recited over wine or grape juice to sanctify the Shabbat and Jewish holidays. Additionally, the word refers to a small repast held on Shabbat or festival mornings after the prayer services and before the meal.
The 39 Melakhot are thirty-nine categories of activity which Jewish law identifies as prohibited by biblical law on Shabbat. Many of these activities are also prohibited on the Jewish holidays listed in the Torah, although there are significant exceptions that permit carrying and preparing food under specific circumstances on holidays.
A Shabbat elevator is an elevator which works in a special mode, operating automatically, to satisfy the Jewish law requiring Jews to abstain from operating electrical switches on Shabbat. These are also known as Sabbath or Shabbos elevators.
Kosher foods are foods that conform to the Jewish dietary regulations of kashrut. The laws of kashrut apply to food derived from living creatures and kosher foods are restricted to certain types of mammals, birds and fish meeting specific criteria; the flesh of any animals that do not meet these criteria is forbidden by the dietary laws. Furthermore, kosher mammals and birds must be slaughtered according to a process known as shechita and their blood may never be consumed and must be removed from the meat by a process of salting and soaking in water for the meat to be permissible for use. All plant-based products, including fruits, vegetables, grains, herbs and spices, are intrinsically kosher, although certain produce grown in the Land of Israel is subjected to other requirements, such as tithing, before it may be consumed.
Negiah, literally "touch", is the concept in Jewish law (Halakha) that forbids or restricts sensual physical contact with a member of the opposite sex except for one's spouse, outside the niddah period, and certain close relatives to whom one is presumed not to have sexual attraction. A person who abides by this halakha is colloquially described as a shomer negiah.
An eruv is a ritual halakhic enclosure made for the purpose of allowing activities which are normally prohibited on Shabbat, specifically: carrying objects from a private domain to a semi-public domain (carmelit), and transporting objects four cubits or more within a semi-public domain. The enclosure is made within some Jewish communities, especially Orthodox Jewish communities.
In Jewish religious law (halakha), the laws of yichud prohibit seclusion in a private area of a man and a woman who are not married to each other. Such seclusion is prohibited out of fear that sexual intercourse or other, lesser acts may occur. A person who is present in order to prevent yichud is called a shomer.
Moshe Feinstein was an American Orthodox rabbi, scholar, and posek. He has been called the most famous Orthodox Jewish legal authority of the twentieth century and his rulings are often referenced in contemporary rabbinic literature. Feinstein served as president of the Union of Orthodox Rabbis, Chairman of the Council of the Moetzes Gedolei HaTorah of the Agudath Israel of America, and head of Mesivtha Tifereth Jerusalem in New York.
Sabbath mode, also known as Shabbos mode or Shabbat mode, is a feature in many modern home appliances, including ovens, dishwashers, and refrigerators, which is intended to allow the appliances to be used by Shabbat-observant Jews on the Shabbat and Jewish holidays. The mode usually overrides the usual, everyday operation of the electrical appliance and makes the operation of the appliance comply with the rules of Halakha.
A Shabbos goy, Shabbat goy or Shabbes goy is a non-Jew who is employed by Jews to perform certain types of work (melakha) that Jewish religious law (halakha) prohibits a Jew from doing on the Shabbat.
Judaism prohibits shaving with a razor on the basis of a rabbinic interpretation of Leviticus 19:27, which states, "Ye shall not round the corners of your heads, neither shalt thou mar the corners of thy beard." The Mishnah interprets this as a prohibition on using a razor on the beard.
In Judaism, a person who is shomer Shabbat or shomer Shabbos is a person who observes the mitzvot (commandments) associated with Judaism's Shabbat, or Sabbath, which begins at dusk on Friday and ends after sunset on Saturday.
A Shabbat lamp is a special lamp that has movable parts to expose or block out its light so it can be turned "on" or "off" while its power physically remains on. This enables the lamp's light to be controlled by those Shabbat observant Jews who accept this use, to make a room dark or light during Shabbat without actually switching the electrical power on or off, an act prohibited by Orthodox Judaism on both Shabbat and the Jewish Holidays.
According to halacha, the operation of a motor vehicle constitutes multiple violations of the prohibited activities on Shabbat. Though Jewish law is based on texts that were written long before the existence of the automobile, when driving one performs various actions which the texts specifically prohibit.
Electricity on Shabbat refers to the various rules and opinions regarding the use of electrical devices by Jews who observe Shabbat. Various rabbinical authorities have pronounced on what is permitted and what is not, but there are many disagreements in detailed interpretation, both between different individual authorities and between branches of Judaism.
Hotzaah, more specifically hotzaah mereshut lereshut or transferring between domains, is one of the activities prohibited on Shabbat in Judaism.
The international date line in Judaism is used to demarcate the change of one calendar day to the next in the Jewish calendar. The Jewish calendar defines days as running from sunset to sunset rather than midnight to midnight. So in the context of Judaism, an international date line demarcates when the line of sundown moving across the Earth's surface stops being the sunset ending and starting one day and starts being the sunset ending and starting the following day.
Objects used in Jewish rituals are known collectively as Judaica. The conservation and restoration of Judaica takes into account the collective body of Jewish religious laws derived from the written and oral Torah known as halacha in order to properly care for these materials. This work involves identifying these objects and therefore knowing how any of these objects are traditionally handled, stored, exhibited, and generally cared for based on their use and significance.
David Rephael Bannett was an American-Israeli electronics engineer, a pioneer in radar technologies in the Israel Air Force, a clandestine buyer for the Haganah in the US, one of the first engineers in the Israeli electronics industry in the country's first years, and the inventor of Shabbat elevators. Bannett was the first lecturer of electronics in the Department of Physics at Bar Ilan University and the Jerusalem College of Technology and was one of the founders of the Beit Hazon neighborhood in Kfar Haroeh.
