Mark 3:28-30
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28Verily I say unto you, All their sins shall be forgiven unto the sons of men, and their blasphemies wherewith soever they shall blaspheme: 29but whosoever shall blaspheme against the Holy Spirit hath never forgiveness, but is guilty of an eternal sin: 30because they said, He hath an unclean spirit.
Mark 3:28-30 (ASV)