Bar and Bat Mitzvah to the event. However, this does not delay the onset of rights and responsibilities of being a Jewish adult which comes about strictly by virtue of age. The obligation to lay tefillin begins when a boy reaches bar mitzvah age. The common custom is for the bar mitzvah boy to begin putting on tefillin one to three months before his bar mitzvah. This way, by the time he is obligated in the commandment, he will already know how to fulfill it properly. The first mention of a party associated with a synagogue bar mitzvah was in the 13th century, so
Mitzvah tank Judaism or displaying images of Rabbi Schneerson and about Moshiach's imminent arrival. Some Mitzvah Tanks have external speakers attached which are used to play klezmer-style music. The tanks, usually manned by young male Lubavitch students in the Yeshiva of Tomchei Temimim, park in areas with heavy people-traffic and seek Jews to perform "Mitzvahs" by asking passers-by: "Are you Jewish?" Lubavitchers manning the tank will usually hand out brochures or cards with information about performing "mitzvot" and about the coming of Moshiach. They encourage passerby to perform mitzvot with an emphasis on those part of the Chabad mitzvah campaigns, and assist