What's the Book of Zephaniah All About?
Who Wrote the Book of Jonah and What's its Purpose?
What Does "the Dragon" in Revelation 12 Represent?
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See SPIRIT, UNCLEAN; DEMON, DEMONIAC.
Orr, James, M.A., D.D. General Editor. "Entry for 'UNCLEAN SPIRIT'". "International Standard Bible Encyclopedia". 1915.