) or phylacteries, are a set of small black leather boxes containing scrolls of parchment inscribed with verses from the Torah.In Rabbinic Judaism, which is the predominant form of Judaism today, tefillin are worn by observant adult Jews during weekday morning prayers.The choice of this particular Greek equivalent to render the Heb.tefillin bears witness to the ancient functional interpretation of the said device as a kind of an amulet.For example, the letters of the text must be written in order - if a mistake is found later, it can't be corrected as the replacement letter would have been written out of sequence.
For instance, Numbers Rabbah 12:3 presents tefillin as capable of defeating "a thousand demons" emerging on "the left side", rabbis Yohanan and Nahman used their sets to repel the demons inhabiting privies They are made in varying levels of quality.
Joseph Caro (16th century) explains that tefillin are placed on the arm adjacent to the heart and on the head above the brain to demonstrate that these two major organs are willing to perform the service of God.
Many have the custom to have high-quality tefillin and beautiful tefillin bags as a Hiddur Mitzvah.
The passages are written by a scribe with special ink on parchment scrolls (klaf).
These are: "Sanctify to me ..." (Exodus 13:1–10); "When YHWH brings you ..." (Exodus –16); "Hear, O Israel ..." (Deuteronomy 6:4–9); and "If you observe My Commandments ..." (Deuteronomy -21).
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The most basic form, called peshutim ("simple"), are made using several pieces of parchment to form the inner walls of the head tefillin.