What is a Jezebel Spirit?

Jezebel is a territorial (principality) spirit that does not inhabit a body. Ephesians 6:12 talk’s about spiritual forces of evil in the heavenly realms 

1 king 16 30 NIV

30 Ahab, son of Omri, did what was evil in the Lord’s sight more than any of his predecessors. 

Chapter 17 1- 4

1 Elijah the Tishbite, from Tishbe in Gilead, said to Ahab: “As the Lord, the God of Israel, lives, whom I serve, during these years there shall be no dew or rain except at my word