What is the blasphemy of the Holy Spirit as described in the old testament and all the new testament scriptures put together?

The blasphemy of the Holy Spirit is the act of willfully and maliciously denying, insulting, and/or rejecting the Holy Spirit and His work. It is the unforgivable sin and the only unforgivable sin because, according to biblical teachings, those who commit it have repeatedly and deliberately rejected the only source of mercy and forgiveness. In Matthew 12:31, Jesus says, “Therefore I say to you, every sin and blasphemy will be forgiven men, but the blasphemy against the Spirit will not be forgiven men.” In Mark 3:29, Jesus adds, “But he who blasphemes against the Holy Spirit never has forgiveness, but is subject to eternal condemnation”. References to the unforgivability of the blasphemy of the Spirit can also found in Luke 12:10 and Hebrews 10:26-29.