'Pig' in the Bible

and the pig (because it has divided hooves and is therefore cloven-footed, but it doesn't ruminate its cud, it is to be unclean for you).

And also the pig, because even though its hoof is divided, it does not chew the cud. It is therefore unclean for you. You must not eat their meat or even touch their carcasses.

The proverb is true that describes what has happened to them: "A dog returns to its vomit," and "A pig that is washed goes back to wallow in the mud."