What material must be used to sew the tefillin, and what is the required number of stitches?
Synopsis
It is a halacha l'Moshe miSinai that tefillin be sewn with sinews from kosher animals. Three stitches per side is the standard; some require all 12 stitches with a single thread. The Rema notes that fewer than 12 stitches (even 10) does not invalidate.
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Must the four Torah passages for tefillin be written in the order they appear in the Torah, and is tefillin written out of order invalid?
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Must the head-tefillin's four passages each be written on a separate parchment, while the arm-tefillin's four passages are written on a single parchment?
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Must tefillin be written with the right hand, and are tefillin written with the left hand invalid?
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Discussion
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