Deuteronomy 14:8
Also the pig is ritually impure to you; though it has divided hooves, it does not chew the cud. You may not eat their meat or even touch their remains.
Leviticus 11:26-27
"'All animals that divide the hoof but it is not completely split in two and do not chew the cud are unclean to you; anyone who touches them becomes unclean.
Isaiah 65:4
They sit among the tombs and keep watch all night long. They eat pork, and broth from unclean sacrificial meat is in their pans.
Isaiah 66:3
The one who slaughters a bull also strikes down a man; the one who sacrifices a lamb also breaks a dog's neck; the one who presents an offering includes pig's blood with it; the one who offers incense also praises an idol. They have decided to behave this way; they enjoy these disgusting practices.
Isaiah 66:17
"As for those who consecrate and ritually purify themselves so they can follow their leader and worship in the sacred orchards, those who eat the flesh of pigs and other disgusting creatures, like mice -- they will all be destroyed together," says the Lord.
Luke 15:15-16
So he went and worked for one of the citizens of that country, who sent him to his fields to feed pigs.
2 Peter 2:22
They are illustrations of this true proverb: "A dog returns to its own vomit," and "A sow, after washing herself, wallows in the mire."