Torah prohibits Melachah, which in general terms is creative work or "control" over one's environment. So, Torah does not prohibit work in the American idea, such as a Rabbi "working" to lead services - which is his job and he is paid (often), which most people would say is "work".
Judaism 101: ShabbatJudaism 101: Shabbat
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The word melachah is rarely used in scripture outside of the context of Shabbat and holiday restrictions. The only other repeated use of the word is in the discussion of the building of the sanctuary and its vessels in the wilderness. Exodus Ch. 31, 35-38. Notably, the Shabbat restrictions are reiterated during this discussion (Ex. 31:13), thus we can infer that the work of creating the sanctuary had to be stopped for Shabbat. From this, the
rabbis concluded that the work prohibited on Shabbat is the same as the work of creating the sanctuary. They found 39 categories of forbidden acts, all of which are types of work that were needed to build the sanctuary:
- Sowing
- Plowing
- Reaping
- Binding sheaves
- Threshing
- Winnowing
- Selecting
- Grinding
- Sifting
- Kneading
- Baking
- Shearing wool
- Washing wool
- Beating wool
- Dyeing wool
- Spinning
- Weaving
- Making two loops
- Weaving two threads
- Separating two threads
- Tying
- Untying
- Sewing two stitches
- Tearing
- Trapping
- Slaughtering
- Flaying
- Salting meat
- Curing hide
- Scraping hide
- Cutting hide up
- Writing two letters
- Erasing two letters
- Building
- Tearing a building down
- Extinguishing a fire
- Kindling a fire
- Hitting with a hammer
- Taking an object from the private domain to the public, or transporting an object in the public domain.
All of these tasks are prohibited, as well as any task that operates by the same principle or has the same purpose. In addition, the rabbis have prohibited handling any implement that is intended to perform one of the above purposes (for example, a hammer, a pencil or a match) unless the tool is needed for a permitted purpose (using a hammer to crack nuts when nothing else is available) or needs to be moved to do something permitted (moving a pencil that is sitting on a prayer book), or in certain other limited circumstances. Objects that may not be handled on Shabbat are referred to as "muktzeh," which means, "that which is set aside," because you set it aside (and don't use it unnecessarily) on Shabbat.
The rabbis have also prohibited travel, buying and selling, and other weekday tasks that would interfere with the spirit of Shabbat. The use of electricity is prohibited because it serves the same function as fire or some of the other prohibitions, or because it is technically considered to be "fire."