Shabbat 28: It's a Unicorn!
Still talking about ritual impurity... Including non-kosher animals. Holy endeavors must use a kosher animal, and the Gemara explains where this rational doesn't apply to tefillin, which are defined by Halakhah le-Moshe mi-Sinai - and no argument. Plus: The "tachash" - an unknown animal (kosher? unkosher?) used in making this Mishkan.
The skinny
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