In the beginning while creating the world,
God: Let there be hyraxes, camels and rabbits with hoofs not divided and let them chew the cuds, and let there be pigs with divided hoofs but will not chew the cuds. Let there be protozoans, sandflies, roundworms, whipworms, nodular worms, tapeworms.
And God saw that what he created was good.
Protozoans, sandflies, roundworms, whipworms, nodular worms, tapeworms: God, how will we live?
God: Be parasites in them. And sandflies, you suck blood and be carriers of protozoan parasites.
Later at the time of Moses,
God: Camel, hyraxes and rabbits are unclean because their hoofs are not divided though they chew the cuds. Pigs are also unclean because, though their hoofs are divided they don't chew the cuds.