Were Annanias and Saphira guilty of the "unforgiveable" sin? In Acts 5 we are presented with the account of Annanias and Saphira.
Summary

they sold a piece of property, and then determined to lie to the Apostles and the Holy Spirit about its value, and give only a portion of the sale to the church
they were struck dead for conspiring to lie to the Holy Spirit
they were NOT struck dead for giving only a portion of the sale to the church

Question
Were Annanias and Saphira guilty of blaspheming the Holy Spirit, and thus ineligible to be saved and/or &quot;lose&quot; their salvation?
I ask not to try to determine if they will be in heaven (the record does not give an indication), or to try to speculate too much, but because I wonder if there is a Biblical argument to be made that this is a prime example of the unforgiveable sin (which, as a Calvinist, I would say meant their &quot;salvation&quot; was never &quot;real&quot; in the first place, and it was only an act).
If it is not, are there any given examples of such a sin in the Bible?
I don't believe that they necessarily did, though it is certainly possible.

The unforgivable sin, in my understanding, is living your life without remorse or repentance to God for your sins. Annanias and Saphira sinned just before they died (were killed), but that doesn't mean they weren't previously saved. After all, all Christians sin after being saved, but the difference is that we do not continue to have unrepentant sin patterns which control us.

It is possible that God was just using Annanias and Saphira as an example, as Paul writes to the Corinthian church in 1 Corinthians 11:27-30. The Corinthians in this case were sinning by profaning the practice of communion with gluttony, and as a consequence God made them sick to the point of death.


  Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty concerning the body and blood of the Lord. Let a person examine himself, then, and so eat of the bread and drink of the cup. For anyone who eats and drinks without discerning the body eats and drinks judgment on himself. That is why many of you are weak and ill, and some have died.


John Piper has a good talk on the unforgivable sin.