2 Peter 2:20-22   20. For if after they have escaped the pollutions of the world through the knowledge of the Lord and Saviour Jesus Christ, they are again entangled therein, and overcome, the latter end is worse with them than the beginning. 21. For it had been better for them not to have known the way of righteousness, than, after they have known it, to turn from the holy commandment delivered unto them. 22. But it is happened unto them according to the true proverb, The dog is turned to his own vomit again; and the sow that was washed to her wallowing in the mire.

Matthew 12:43-45   43. When the unclean spirit is gone out of a man, he walketh through dry places, seeking rest, and findeth none. 44. Then he saith, I will return into my house from whence I came out; and when he is come, he findeth it empty, swept, and garnished. 45. Then goeth he, and taketh with himself seven other spirits more wicked than himself, and they enter in and dwell there: and the last state of that man is worse than the first. Even so shall it be also unto this wicked generation.