Shabbat 28a and Shabbat 28b, figuring out how we know hides of non kosher animals are susceptible to ohel impurity, and some of the Halakhot leMoshe miSinai of tefillin, such as that they have to be square, and be sewn of kosher animals.
Shabbat 28a and Shabbat 28b, figuring out how we know hides of non kosher animals are susceptible to ohel impurity, and some of the Halakhot leMoshe miSinai of tefillin, such as that they have to be square, and be sewn of kosher animals.