Must the yud-knot of the shel yad face the heart, and must it remain adjacent to the tefillin box?
Synopsis
The correct practice is that the yud-knot faces the heart (toward the body) with the tefillin box facing outward. The yud must not become separated from the tefillin box. This is described as established custom (minhag) but the Gra considers it a Talmudic requirement.
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