Aharon and Moshe bless the nation.  G-d allows the Jewish People to sense His Presence after they complete the Mishkan and draw
closer to Him through their mitzvos there.

Aharon's sons, Nadav and Avihu, innovate an original offering that
was not commanded by G-d.  A fire comes from before G-d and
consumes them, stressing the need to perform the commandments only as
Moshe directs.  Moshe consoles Aharon, who grieves in silence.

 Moshe directs the kohanim as to their behavior during the mourning
period, and warns them that they must not drink intoxicating
beverages before serving in the Mishkan. 

The Torah lists the two characteristics of a kosher animal:
it has split hooves; and it chews, regurgitates, and re-chews its food.

The Torah specifies by name those non-kosher animals which have
only one of these two signs.  A kosher fish has fins and easily removable
scales.  All birds not included in the list of forbidden families are permitted.
The Torah forbids all types of insects except for four species of locusts.
Details are given of the purification process after coming in contact
with ritually-impure species.

The Jewish People are commanded to be separate,
and holy -- like G-d.