Mark 3:28-30
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28Verily I say unto you, All sins shall be forgiven unto the sons of men, and blasphemies wherewith soever they shall blaspheme: 29But he that shall blaspheme against the Holy Ghost hath never forgiveness, but is in danger of eternal damnation: 30Because they said, He hath an unclean spirit.
Mark 3:28-30 (KJV)