Can a true believer be saved if they blaspheme the Holy Spirit?

Can a true believer be saved if they at some point blaspheme the Holy Spirit? Or could anyone who blasphemes the Holy Spirit ever have been a True believer?

The “unpardonable sin” of blaspheming the Holy Spirit is something a believer cannot do. We encounter this topic with Jesus locked in contentious dialogue about His miracles with Jewish leadership. In John 8:13 the Pharisees charge Christ with promoting Himself through lies. Jesus replies that even if He is promoting Himself, it is because of Who He is and where He has come from the Father. John 8:18 is ...