Upvote:4
The only place in the Bible where any sin is mentioned as being unforgivable is in Matthew 12:
Matthew 12:31-32 (NLT)
31 βSo I tell you, every sin and blasphemy can be forgivenβexcept blasphemy against the Holy Spirit, which will never be forgiven. 32 Anyone who speaks against the Son of Man can be forgiven, but anyone who speaks against the Holy Spirit will never be forgiven, either in this world or in the world to come.
Now the question is if taking God's name in vain is blasphemy or speaking against the Holy Spirit. Personally, I say that it is not because you are not targeting the Holy Spirit, so to speak. I don't quite have Scriptural backup for that, but this answer and that answer on this question generally indicate that the answer to that new question is "no".