shabbat 28

uncovering the mystery of the one-horned multi-coloured animal, sacrificed by Adam, that appeared to Moses,
using tefillin, linen, and hairy goats

(debate about hide from non-kosher animals could become impure from covering a corpse leads to speculation of the identity of the tachash, whose skin was part of the covering of the Mishkan. for english translation of this talmud page, see here)