Eruv techumin
Encyclopedia
An eruv techumin for traveling enables a Jew to travel on Shabbat
Shabbat
Shabbat is the seventh day of the Jewish week and a day of rest in Judaism. Shabbat is observed from a few minutes before sunset on Friday evening until a few minutes after when one would expect to be able to see three stars in the sky on Saturday night. The exact times, therefore, differ from...

 or a Jewish holiday
Jewish holiday
Jewish holidays are days observed by Jews as holy or secular commemorations of important events in Jewish history. In Hebrew, Jewish holidays and festivals, depending on their nature, may be called yom tov or chag or ta'anit...

. He prepares a food prior to Shabbat or the holiday on which he plans to travel farther than is normally allowed on such days. (This is unconnected to the method of transportation which is being used, all of which - other than walking - are forbidden on such days.)

Normally, one can walk anywhere in his city or town on such days, but only within that area and up to 2000 cubit
Cubit
The cubit is a traditional unit of length, based on the length of the forearm. Cubits of various lengths were employed in many parts of the world in Antiquity, in the Middle Ages and into Early Modern Times....

s past the city limits. (The definition of "city limits" in Jewish law is beyond the scope of this article. Suffice it to say that it relates to the area which is actually populated, and not to the political borders of a municipality.) If one needs to travel farther than that, he can leave some food in a certain location prior to that holiday or Sabbath. This will temporarily establish his home as at the location of the food, allowing him to travel 2000 cubits from the food. There are many other details beyond the scope of this article.
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