2 Peter 2:17-19
17-19There's nothing to these people—they're dried-up fountains, storm-scattered clouds, headed for a black hole in hell. They are loudmouths, full of hot air, but still they're dangerous. Men and women who have recently escaped from a deviant life are most susceptible to their brand of seduction. They promise these newcomers freedom, but they themselves are slaves of corruption, for if they're addicted to corruption—and they are—they're enslaved.
20-22If they've escaped from the slum of sin by experiencing our Master and Savior, Jesus Christ, and then slid back into that same old life again, they're worse than if they had never left. Better not to have started out on the straight road to God than to start out and then turn back, repudiating the experience and the holy command. They prove the point of the proverbs, "A dog goes back to its own vomit" and "A scrubbed-up pig heads for the mud."