The Torah says that an animal is only kosher if it has split hooves and also chews its cud. Then the Torah lists four animals that aren't kosher because they don't have split hooves and also chew their cud. Why does the Torah list those animals? We know they aren't kosher because they don't have split hooves and also chew their cud.
Leviticus 11 (JPS)
1 And the LORD spoke unto Moses and to Aaron, saying unto them: 2 Speak unto the children of Israel, saying: These are the living things which ye may eat among all the beasts that are on the earth. 3 Whatsoever parteth the hoof, and is wholly cloven-footed, and cheweth the cud, among the beasts, that may ye eat. 4 Nevertheless these shall ye not eat of them that only chew the cud, or of them that only part the hoof: the camel, because he cheweth the cud but parteth not the hoof, he is unclean unto you. 5 And the rock-badger, because he cheweth the cud but parteth not the hoof, he is unclean unto you. 6 And the hare, because she cheweth the cud but parteth not the hoof, she is unclean unto you. 7 And the swine, because he parteth the hoof, and is cloven-footed, but cheweth not the cud, he is unclean unto you. 8 Of their flesh ye shall not eat, and their carcasses ye shall not touch; they are unclean unto you.
Deuteronomy 14 (JPS)
6 And every beast that parteth the hoof, and hath the hoof wholly cloven in two, and cheweth the cud, among the beasts, that ye may eat. 7 Nevertheless these ye shall not eat of them that only chew the cud, or of them that only have the hoof cloven: the camel, and the hare, and the rock-badger, because they chew the cud but part not the hoof, they are unclean unto you; 8 and the swine, because he parteth the hoof but cheweth not the cud, he is unclean unto you; of their flesh ye shall not eat, and their carcasses ye shall not touch.