supererogatory behavior

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Following the stringencies of different opinions

There is a tangential discussion in 'Eruvin, Daf 6b-7a about whether or not we can take the stringencies of two conflicting opinions. The Gemara seems adamant that we cannot, though there are examples ...
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Why do Lubavitchers put on tefillin of Rabbeinu Tam from bar mitzva?

Based on this question, Shulchan Aruch (O"C 33) says that only people who are noted for their piety should put on Rabbeinu Tam tefillin. Why do Lubavitcher chasidim (and descendants of certain ...
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Why do Tefillin have filler material in the base of the batim?

Mikshah tefillin are tefillin battim which have no filler material in the titurah (base). Why is filler material even necessary? The photo below illustrates the thickness with a piece of filler ...
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Extrapolating from individual responsa to form a general psak halacha

R' Tsvi Heber of the Kashruth Council of Canada writes: Is it permitted to order whole fruit[34] or drink water in a non-kosher restaurant? If not, can one enter a non-kosher restaurant to use ...