Matthew 12:31
Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven.
What it says
Every sin and blasphemy will be forgiven, except blasphemy against the Spirit.
What it is doing
Jesus names the exception that will not be pardoned.
In context
31Therefore I tell you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven. 32Whoever speaks a word against the Son of Man will be forgiven, but whoever speaks against the Holy Spirit will not be forgiven, either in this age or in the one to come.