Mark 3:28-30
28 “I assure you and most solemnly say to you, all sins will be forgiven the sons of men, and all the abusive and blasphemous things they say;
29 but whoever (a)blasphemes against the Holy Spirit and His power [by attributing the miracles done by Me to Satan] never has forgiveness, but is guilty of an everlasting sin [a sin which is unforgivable in this present age as well as in the age to come]”—(A)
30 [Jesus said this] because the scribes and Pharisees were [attributing His miracles to Satan by] saying, “He has an unclean spirit.”
Footnotes:
a.
Mark 3:29: Blasphemy of the Holy Spirit is denying all the work of the Holy Spirit. This leads ultimately to rejecting the deity of Christ.