in its technical English sense, signifies the speaking evil of God and in this sense it is found (Psalms 74:18; Isaiah 52:5; Romans 2:24) etc. But according to its derivation it may mean any species of calumny and abuse: see (1 Kings 21:10; Acts 18:6; Jude 1:9) etc. Blasphemy was punished by stoning, which was inflicted on the son of Shelomith. (Leviticus 24:11) On this charge both our Lord and St. Stephen were condemned to death by the Jews. The blasphemy against the Holy Ghost, (Matthew 12:32; Mark 3:28) consisted in attributing to the power of Satan those unquestionable miracles which Jesus performed by "the finger of God" and the power of the Holy Spirit. It is plainly such a state of wilful, determined opposition to God and the Holy Spirit that no efforts will avail to lead to repentance. Among the Jews it was a sin against God answering to treason in our times.
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Smith, William, Dr. "Entry for 'Blasphemy'". "Smith's Bible Dictionary".