Matthew 12:44
Then it says: I will return to my house from which I came. And when it comes, it finds the house empty, swept, and put in order. The demon's return to its former home — the person from whom it was expelled — finds the house empty, swept, and put in order. The emptiness is the critical word: the house that was cleansed but not filled with something better is vulnerable to reoccupation. The partial reformation that leaves the house empty is more dangerous than the original condition.