Matthew 7:6
"Give not that which is holy to the dogs, nor throw your pearls to the swine; otherwise they will trample them under their feet and then turn and attack you.
Luke 8:33
The demons came out of the man and left him, and entered into the swine; and the herd rushed violently over the cliff into the Lake and were drowned.
Luke 15:15
So he went and hired himself to one of the inhabitants of that country, who sent him on to his farm to tend swine;
2 Peter 2:18-22
For, while they pour out their frivolous and arrogant talk, they use earthly cravings--every kind of immorality--as a bait to entrap men who are just escaping from the influence of those who live in error.