2 Peter 2:12-14, 22

But these [false teachers], like unreasoning animals, [mere] creatures of instinct, born to be captured and destroyed, reviling things they do not understand, will also perish in their own corruption [in their destroying they will be destroyed], suffering wrong [destined for punishment] as the wages of doing wrong. They count it a delight to revel in the daytime [living luxuriously]. They are stains and blemishes [on mankind], reveling in their deceptions even as they feast with you. They have eyes full of adultery, constantly looking for sin, enticing and luring away unstable souls. Having hearts trained in greed, [they are] children of a curse.

The thing spoken of in the true proverb has happened to them, “THE DOG RETURNS TO HIS OWN VOMIT,” and, “A sow is washed only to wallow [again] in the mire.” [Prov 26:11]