What does the Bible say about the blasphemy against the Holy Spirit?

In Matthew 12:31-32, Jesus clearly states that all manner of sin and blasphemy shall be forgiven unto men, except for the blasphemy against the Holy Spirit. This sin involves a willful and obstinate rejection of the Holy Spirit's work, choosing to persist in unbelief even in the face of clear evidence of God's truth. It signifies a deliberate obstinacy in denying the gospel and the cleansing blood of Christ, leading to a reprobate mind without repentance. The Pharisees exemplified this blasphemy as they attributed the miraculous works of Christ to the devil, instead of acknowledging the Spirit's divine authority behind them.