2 Peter 2:20-22

Goodspeed(i) 20 For if after men have escaped the corrupting influences of the world through the knowledge of the Lord and Savior Jesus Christ, they again become entangled in them and are overcome by them, their final condition is worse than their former one. 21 For it would have been better for them never to have known the way of uprightness than after knowing it to have turned their backs upon the sacred command with which they had been intrusted. 22 What has happened to them shows the truth of the proverb, "A dog returns to what he has vomited up, and a sow that has washed goes back to wallow in the mire."