Albert Barnes Commentary Leviticus 11:7

"And the swine, because he parteth the hoof, and is clovenfooted, but cheweth not the cud, he is unclean unto you." — Leviticus 11:7 (ASV)

He divides the hoof... - It is cloven-footed and completely, etc. See Leviticus 11:3 note.

Of all the quadrupeds whose flesh the Law forbids to be eaten, the pig seems to have been regarded as the most unclean. Compare the marginal references. Several other nations have agreed with the Hebrews in this respect, the reason being that its flesh is unwholesome, especially in warm climates.