Proverbs 26:11
Like a dog that returns to its vomit, so a fool repeats his folly.
2 Peter 2:22
They are illustrations of this true proverb: "A dog returns to its own vomit," and "A sow, after washing herself, wallows in the mire."
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 live there, so the last state of that person is worse than the first. It will be that way for this evil generation as well!"