2 Peter 2:20-22

²⁰For if, after they have escaped the defilement of the world through the knowledge of the Lord and Savior, Jesus Christ, they are again entangled therein and overcome, the last state has become worse with them than the first. ²¹For it would be better for them not to have known the way of righteousness, than, after knowing it, to turn back from the holy commandment delivered to them. ²²But it has happened to them according to the true proverb, "The dog turns to his own vomit again," and "the sow that had washed to wallowing in the mire."