Contributed by John Lowe on Aug 9, 2017
The “unclean spirit” is Satan or his demons. Satan delights in causing uncleanness in persons, places and things. His going out of a man, as presented here, is voluntary, not like his eviction by force as when Christ cast out demons.
Harmony of the Gospels
Title: Jesus Answers a Demand for a Sign
Matthew 12:38-45, Luke 11:24-26, 29-36
43 When the unclean spirit is gone out of a man, he walketh through dry places, seeking rest, and findeth none.
44 Then he saith, I will return into