"But a certain man named Ananias, with his wife Sapphira, sold a piece of property, and kept back some of the price for himself, with his wife's full knowledge, and bringing a portion of it, he laid it at the apostles' feet.  But Peter said, 'Ananias, why has Satan filed your heart to lie to the Holy Spirit, and to keep back some of the land?  While it remained unsold, did it not remain your own?  And after it was sold, was it not under your control?  Why is it that you have conceived this deed in your heart?  You have not lied to men, but to God.'  And as he heard these words, Ananias fell down and breathed his last, and great fear fell upon all who heard of it.  And the young men arose and covered him up, and after carrying him out, they buried him."

In the book of Acts, we see a new role for the church:  To witness what God is doing, then to tell people that God is doing it, then to tell people about God.

The church is simply to debrief the happenings of God to help man come into relationship with God.

This is what we see here in the story of Ananias.

Don't make the mistake of thinking Peter was mad at him for lying.  Don't think that Peter asked God to kill him.  Peter would be the first to say that he did not have that power.

Instead, realize that Peter was so connected to the Holy Spirit, in constant dialog, that he simply told the crowd of believers, Ananias included, what God was doing.

This is why Peter's charge against Ananias was, 'You have lied to the Holy Spirit.'  I think we can all agree that this story teaches us not to lie to God.  But more, we, the church, need to speak in witness for God constantly.