He put on his "tzitzit" and "tefillin" daily. The obligation to lay tefillin begins when a boy reaches bar mitzvah age. Other practices include circumcision, dietary laws, Shabbat, Passover, Torah study, Tefillin, purity and others. Halacha forbids speaking or being distracted while putting on the tefillin. Scrolls not processed in this way are considered invalid (Hilkoth Tefillin 1&colon;8 & 1&colon;14, Maimonides). Some non-Orthodox scholars think that tefillin may play an apotropaic function. The ultimate origin of Hebrew "tefillin" is uncertain. The biblical verses often cited as referring to tefillin are obscure. Legends exist that Rashi's daughters wore tefillin. The duty of laying tefillin rests upon Jews after the age of thirteen years. Women affiliated with the Conservative movement wrap tefillin. Tradition says that Rashi's daughters wore tefillin, a practice normally reserved for men. Traditions exist of some prominent women laying tefillin. There are several instances of women who allegedly wore tefillin. All, however, put on and remove the head tefillin while standing.