Luke 15:15-16

and he was reduced to want, which forc'd him to make his application to one of the inhabitants there, who sent him to his farm to look after his swine.

2 Peter 2:22

but the proverb is exactly verified in them, "the dog is return'd to his own vomit: the sow that was wash'd, is wallowing 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
and he was reduced to want, which forc'd him to make his application to one of the inhabitants there, who sent him to his farm to look after his swine.
2 Peter 2:22
but the proverb is exactly verified in them, "the dog is return'd to his own vomit: the sow that was wash'd, is wallowing in the mire."