2 Peter 2:21-22

American Standard Version

²¹ For it were better for them not to have known the way of righteousness, than, after knowing it, to turn back from the holy commandment delivered unto them. ²² It has happened unto them according to the true proverb, ^[a]The dog turning to his own vomit again, and the sow that had washed to wallowing in the mire.