Contradiction with Proverbs 12:10
Matthew 8:30 describes the presence of a herd of pigs, whereas Proverbs 12:10 emphasizes caring for animals, which contradicts the swine's ultimate fate in the narrative.
Proverbs 12:10: A righteous [man] regardeth the life of his beast: but the tender mercies of the wicked [are] cruel. [tender...: or, bowels]
Contradiction with Leviticus 11:7
Leviticus declares pigs as unclean animals, whereas Matthew 8:30 references their presence in a herd, an area associated with Gentiles, indirectly contradicting Jewish cleanliness laws.
Leviticus 11:7: And the swine, though he divide the hoof, and be clovenfooted, yet he cheweth not the cud; he [is] unclean to you.
Contradiction with Isaiah 65:4
Indicates that swine are associated with unclean practices, whereas Matthew 8:30 mentions a herd of swine without these implications.
Isaiah 65:4: Which remain among the graves, and lodge in the monuments, which eat swine's flesh, and broth of abominable [things is in] their vessels; [broth: or, pieces]
Contradiction with 2 Peter 2:22
Describes a negative connotation towards swine, contradicting the narrative in Matthew 8:30 where the pigs are more neutral figures until the subsequent event.
2 Peter 2:22: But it is happened unto them according to the true proverb, The dog [is] turned to his own vomit again; and the sow that was washed to her wallowing in the mire.