parashah shemini

G‑d gives the commandments of Kosher, explaining how to distinguish between kosher and non-kosher animals, fish, and birds. Kosher animals must chew their cud and have cloven feet. The Torah lists four animals that have only one of these attributes, but not both, and are therefore non-kosher. 
Kosher fish must have fins and scales. 

Mosaic scales kosher fishon a CD

Shabbath Parah

Shabbath of the red heifer
Takes place on the Shabbat before Shabbat HaChodesh, in preparation for Pesach. Numbers 19:1-22 describes the parah adumah ("red heifer") in the Jewish temple as part of the manner in which the kohanim and the Jewish people purified themselves so that they would be ready ("pure") to sacrifice the korban Pesach.

Painting a red heifer from Gauguin 

 

Paul Gauguin- The Red Cow

The Children version