Matthew 12:31
Therefore I tell you, every sin and blasphemy will be forgiven people, but the blasphemy against the Spirit will not be forgiven. The teaching on the unforgivable sin defines the sin specifically in the context of Matthew 12: the sin is attributing to Satan what is the work of the Spirit (verse 28). Every other sin and blasphemy falls within the scope of God's forgiveness; the deliberate, determined attribution of the Spirit's work to demonic power is the one sin that places the sinner outside the forgiveness available in the kingdom.