2 PETER 2:

19 While they promised them liberty, they themselves are servants of corruption. For by whom a man is overcome, of that he also is a servant.

20 For if, after they have escaped the pollutions of the world through the knowledge of the Lord and Savior Jesus Christ, they are again entangled therein and overcome, the latter end is worse for them than the beginning.

21 For it had been better for them not to have known the way of righteousness, than, after knowing it, to turn from the holy commandment delivered to them.

22 So it happened to them according to the true proverb, “The dog returns to its own vomit,” and the sow that was washed returns to her wallowing in the mire.