Proverbs 26:11 Prov. 26:11
As a dog returneth to his vomit, so a fool returneth to his folly.
2. Peter 2:22 2. Pet. 2:22
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.