Blasphemy: In the sense of speaking evil of God this word is found in
(Psalms 74:18)
(Isaiah 52:5; Romans 2:24; Revelation 13:1,6; 16:9,11,21) It denotes also any kind of
calumny, or evil-speaking, or abuse
(1 Kings 21:10; Acts 13:45; 18:6) Our Lord
was accused of blasphemy when he claimed to be the Son of God
(Matthew 26:65) comp.
(Matthew 9:3; Mark 2:7) They who deny his Messiahship
blaspheme Jesus
(Luke 22:65; John 10:36) Blasphemy against the Holy Ghost
(Matthew 12:31,32; Mark 3:28,29; Luke 12:10) is regarded by some as a continued
and obstinate rejection of the gospel, and hence is an unpardonable
sin, simply because as long as a sinner remains in unbelief he
voluntarily excludes himself from pardon. Others regard the expression
as designating the sin of attributing to the power of Satan those
miracles which Christ performed, or generally those works which are
the result of the Spirit's agency.