Matthew 7:6
Do not give what is sacred to dogs; nor yet throw your pearls before pigs, lest they should trample them under their feet, and then turn and attack you.
Luke 8:33
They came out from the man and took possession of the pigs; and the drove rushed down the steep slope into the lake and were drowned.
Luke 15:15
So he went and engaged himself to one of the people of that country, who sent him into his fields to tend pigs.
2 Peter 2:18-22
With boastful and foolish talk, they appeal to the passions of man's lower nature, and, by their profligacy, entice those who are just escaping from the men who live such misguided lives.