Blaspheming the Holy Spirit: Can you help me understand the scripture indicating that speaking against the Holy Spirit is the unforgivable sin? [Matthew 12:31, Acts 13, I John 1:7, 9]. Unforgivable Sin: If I denied God and Christ to save myself from getting my head cut-off while in Iran, can I be pardoned? [Matthew 16:25, 10:32-33].