There are elaborate rules concerning preparation and consumption of food in Judaism. They form a significant body of the ritual component of everyday life for orthodox Jewish families and represent part of the Jewish covenant with God, i.e. the things that Jews do to prove their faith and obedience to God and are required to perform to retain divine favour.
The Jewish dietary and ritual laws are set out in the Book of Leviticus, one of the five books of the Old Testament that sets out Mosaic laws. Many of the rules concern preparation and eating of meat, prohibition of mixing meat with dairy, and the labelling of certain foods "unclean" (pork, shellfish).