Luke 15:15-16

So he went and hired himself out to a citizen of that country, and he sent him to his fields to feed hogs.

2 Peter 2:22

In them is verified the truth of the proverb, "A dog turns back to what he has vomited"; and of that other proverb, "A sow that has washed herself goes back to wallow in the mire."

Treasury of Scripture Knowledge

Summary

And the swine, because it divideth the hoof, yet cheweth not the cud, it is unclean unto you: ye shall not eat of their flesh, nor touch their dead carcase.

Bible References

The swine

Luke 15:15
So he went and hired himself out to a citizen of that country, and he sent him to his fields to feed hogs.
2 Peter 2:22
In them is verified the truth of the proverb, "A dog turns back to what he has vomited"; and of that other proverb, "A sow that has washed herself goes back to wallow in the mire."