Kiddush is a blessing recited over wine or grape juice to
sanctify the Shabbat, Yom Tov or a Bat Miztvah or Bar Mitzvah
ceremony. The Torah refers to two requirements concerning
Shabbat - to keep it and to remember it (Shamor and Zachor).
Jewish law therefore requires that Shabbat be observed in two
respects. One must "keep it" by refraining from thirty-nine
forbidden activities, and one must remember it by making special
arrangements for the day, and specifically through the kiddush
ceremony. Reciting kiddush before the meal on the eve of Shabbat
and Jewish holidays is thus regarded as a commandment from the
Torah (as it is explained by Talmud Bavli). Reciting kiddush
before the morning meal on Shabbat and holidays, however, is a
requirement of rabbinic origin. Kiddush is not usually recited
at Shalosh Seudos, although The Rambam was of the opinion that
wine should be drunk at this meal as well. In this section, find
a great selection of Kiddush cups - the cup used to hold the
wine during the Kiddush ceremon