But it has happened to them according to the true proverb: "A dog returns to his own vomit," and, "a sow, having washed, to her wallowing in the mire."
2 Peter 2:22
Surrounding context
2:21 For it would have been better for them not to have known the way of righteousness, than having known it, to turn from the holy commandment delivered to them.
2:22 But it has happened to them according to the true proverb: "A dog returns to his own vomit," and, "a sow, having washed, to her wallowing in the mire."