Proverbs 26:11
A dog that returns to its vomit is like a fool who reverts to his folly.
2 Peter 2:22
The proverb is true that describes what has happened to them: "A dog returns to its vomit," and "A pig that is washed goes back to wallow in the mud."
Exodus 8:15
But when Pharaoh saw that there was relief, he hardened his heart and did not listen to them, just as the LORD had predicted.
Matthew 12:45
Then it goes and brings with it seven other spirits more evil than itself, and they go in and settle there. And so the final condition of that person becomes worse than the first. That's just what will happen to this evil generation!"