According to Judaic theology
the unclean spirit refers to Dybbuks, spirits
of deceased persons who were not laid to rest
and thus became demons.
Unclean in the GREEK—
akathartos or ä-kä'-thär-tos is foul, unclean.
Spirit in the GREEK—
pneuma or pnyü'-mä is evil (spirit),
superhuman.
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