Should a God-fearing person (yerei shamayim) wear two pairs of tefillin — one according to Rashi and one according to Rabbeinu Tam — to fulfill the obligation according to both opinions?
Synopsis
The Mechaber rules that a God-fearing person should ideally wear both pairs simultaneously, intending that the correct pair fulfills the obligation and the other is merely like straps. If he cannot wear them simultaneously, he wears them sequentially, ideally without a blessing on the second pair. The Mechaber further requires that this practice be limited to those known for piety.
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Discussion
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