Shabbat:
What is Shabbat?
Shabbat is the seventh day of the Jewish week and is the day of rest and abstention from work as commanded by God. Shabbat involves two interrelated commandments: to remember (zachor) and to observe (shamor).
Origins in the Torah
The etiology of Shabbat is given in the first two chapters of the Book of Bereishit (Genesis), although the name of the day does not actually appear there: God worked six days at creating the world on the seventh he ceased working (shavat mi-kol melaʾkhto), blessed the day, and declared it holy.
The special status of this seventh day – and its name – were disclosed to the Israelite people in the episode of the manna. God supplied each day’s need of manna for five days; on the sixth, a double portion was provided to last through the seventh day, on which no manna appeared. Correspondingly, the Israelites were commanded not to go out at all but to remain at home on the seventh day. Thus they learned that the seventh day was “a Shabbat of the Lord,” which they must honor by desisting from their daily food-gathering labor.
According to the Book of Exodus, work is to cease on the seventh day in order to give slaves and draft animals rest, a statute that must be observed even during the critical plowing and harvest seasons. The Book of Deuteronomy’s version embodies this humanitarian motive in its divergent rationale of the Shabbat rest – Israel is to keep the Shabbat so that its slaves might rest, and because God so commanded. God’s instructions for building the Tabernacle begins with an admonition to keep the Shabbat, indicating its precedence even over the duty of building the Sanctuary. The Shabbat is then called a sign of both God’s consecration of Israel and of His six-day creation.
Read more main link : http://www.jewishvirtuallibrary.org/jsource/Judaism/shabbat.html
Shabat A to Z
http://www.chabad.org/library/article_cdo/aid/257569/jewish/Shabbat-A-to-Z.htm
Some Shabbat Quick Guides
http://www.chabad.org/library/article_cdo/aid/253216/jewish/Quick-Guides.htm
Sabat Mitzvas:
http://www.chabad.org/library/article_cdo/aid/607593/jewish/Shabbat.htm