[The following is an excerpt from an article on www.wikipedia.com]
The Torah states in Numbers 15:38: "Speak to the children of Israel and you shall say to them that they shall make for themselves fringes on the corners of their garments, throughout their generations, and they shall affix a thread of blue (Hebrew: תכלת - tekhelet) on the fringe of each corner."
Tzitzit are also commanded in Deuteronomy 22:12, which says: "You shall make yourself twisted threads, on the four corners of your garment with which you cover yourself."
Tzitzit are attached today only to Jewish religious garments, such as a tallit gadol (large prayer shawl). This is due in part to the fact that today's typical garment does not have the required 4 corners, and thus the fringes are not necessary. Traditional Jews wear a tallit katan (small prayer shawl) in order to fulfill this commandment at their own volition (although some consider it a transgression to miss a commandment that one has the ability to fulfill).
Various reasons are given for the commandment. The Torah itself states: "So that you will remember to do the commandments." In addition, it serves as a reminder of the Exodus from Egypt (Numbers 15:40). The Talmud equates its observance with that of all the mitzvot. Rambam (Comm. Pirkei Avot 2:1) includes it as a major mitzvah along with Brit Milah and Korban Pesah.
The two sets of stands are knotted together twice, and then the "shamash" (a longer strand) is wound around the remaining seven strands a number of times (see below). The two sets are then knotted again twice. This procedure is repeated three times. A commonly formed pattern of windings is 7-8-11-13 (totalling 39 winds - the gematria of the "The LORD is One" Deuteronomy 6:4). Others, especially Sephardim, have 10 and 5 and 6 and 5, a combination that represents directly the spelling of the Tetragrammaton.
The simple things matter when they lead us to the big things ...
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