ChristianAnswers.Net WebBible Encyclopedia
The first biblical example of blasphemy is found in Leviticus 24:11. God provided a death sentence on the blasphemer, the son of Shelomith, and also established a standing law at this time for the stoning of blasphemers (Leviticus 24:15-16. [Learn more]
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.