Wajikra 11:29 Kabbala: Zohar

From the lower aspects referring to animals, beasts and birds that were molded into shape by that impure spirit forms, namely private spirits, were drawn out. These were enclothed by other vestments, such as the forms of impure animals, and the Torah said of them, "These shall be unclean to you" (Vayikra 11:29). These forms include pigs and the birds and animals that belong to the Other Side. The spirit is called by that name, that is, defiled, and the body is its vestment. The body is called the flesh of the pig, because it is a pig in its inner being, in its spirit, while the flesh is a garment covering that spirit. Therefore, both aspects, those included within the secret of man and those included with the secret of the impure, are separated from and oppose each other. On the side of holiness are the spirit of man in general, and the spirits of pure animals, beasts and fowl, which are the particular. From the side of wicked man is the impure wicked man, who is considered the general aspect, and the spirits of impure animals, beasts and fowl, that are the particulars. They oppose each other. Every kind of animal stays with its own kind and does not mix with the opposite kind. Even if it does, it eventually returns to its own kind.