Tefillin

Definition and stakes

George Herbert Box,  1911 Encyclopædia Britannica (1911)

“ PHYLACTERY (φυλακτήριον) , a Greek word meaning “guard” (sc. against misfortune) , i.e. an amulet. It is applied in the New Testament to the tefillin or “prayer-thongs” worn by orthodox Jews daily at morning-prayer (whether at home or in the synagogue) . The title employed in Hebrew, tefillin, seems really to be derived from an Aramaic term meaning “attachments,” “ornaments”; it corresponds to the Biblical Hebrew word rendered “frontlets” (totafôth) . The tefillin or phylacteries are worn, one on the left arm (the “hand-tefilla”) , and the other on the head (the “head-tefilla”) . ”
Source: Wikisource

Yosef Karo,  Translation:Shulchan Aruch — Orach Chaim 30Time to Put on Tefillin

“ One is prohibited to put Tefillin on at night since he may forget [that he has them on] and sleep in them. If he puts them on before the sun sets and it happens to get dark, even if he wears them the whole night, it is permitted. [However] we do not teach [people] to do this. If he did not remove the Tefillin once the sun set since he had no place to guard them and therefore, left them on to protect them... ”
Source: Wikisource

Yosef Karo,  Translation:Shulchan Aruch — Orach Chaim 27Laws Relating to the Place and the Manner in which Tefillin are Put On…

“ Paragraph 6 — A lefty who does all his work with his left hand puts his Tefillin on his "left hand" which is the right hand of all people. And if he uses both hands, he places them on the left of all people. If he writes with his right hand and does all other work with his left hand, or if he writes with his left hand and does all other work with his right hand, there are those who say to put the Tefillin on his weaker hand because we "need the weaker hand." ”
Source: Wikisource

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