2 Peter 2:12-14, 22

These individuals are nothing but brute beasts—irrational creatures, born in the wild to be caught and destroyed—and they will perish like beasts. They are professional insulters, who slander whatever they don’t understand, and in their destruction they will be destroyed. For all the evil they have done will come crashing down on them. They consider it their great pleasure to carouse in broad daylight. When they come to your love feasts they are but stains and blemishes, reveling in their deceptions as they feast with you. They are addicted to adultery, with eyes that are insatiable, with sins that never end. They seduce the vulnerable and are experts in their greed—they are but children of a curse!

They become illustrations of the true proverb: A dog will return to his own vomit and a washed pig to its rolling in the mud.