Deuteronomy 14:9

Modern English Version

These you shall eat of all that are in the water: All that have fins and scales you may eat.

See the chapter Copy

Whatever does not have fins and scales you may not eat. It is unclean to you.

The pig is unclean to you because it divides the hoof, yet it does not chew the cud. You must not eat of their flesh or touch their dead carcass.