And so I tell you, every kind of sin and slander can be forgiven, but blasphemy against the Spirit will not be forgiven. Anyone who speaks a word against the Son of Man will be forgiven, but anyone who speaks against the Holy Spirit will not be forgiven, either in this age or in the age to come. - Matthew 12:31-32 New International Version
Why should blasphemy against the Holy Spirit be unforgivable when blasphemy against Jesus was forgivable? Wasn't the Holy Spirit working through Jesus? Blasphemy against the Son should be blasphemy against the Father and Holy Spirit.