"When an unclean spirit comes out of a man, it roams through waterless places looking for rest, and not finding rest, it then says, 'I'll go back to my house where I came from.'
References for Luke 11:24
And returning, it finds [the house] swept and put in order.
Then it goes and brings seven other spirits more evil than itself, and they enter and settle down there. As a result, that man's last condition is worse than the first."