Must a new blessing be recited if the knot of the arm tefillin broke at the very start of tightening?
Synopsis
The Mechaber rules that if the knot broke at the very beginning of tightening (before the mitzvah was fulfilled) and the person did not take his mind off the tefillin, no new blessing is needed. The Gra and others analyze the fine distinctions regarding when the blessing was effective.
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Discussion
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