Whatever parts the hoof, and is cloven-footed, and chews the cud among the animals, that you may eat.

The pig, because he has a split hoof, and is cloven-footed, but doesn't chew the cud, he is unclean to you.

"'Every animal which parts the hoof, and is not cloven-footed, nor chews the cud, is unclean to you. Everyone who touches them shall be unclean.