What does the Bible say about lying to the Holy Ghost?

In Acts 5:3, Peter confronts Ananias, noting that lying to the Holy Ghost is a grave offense because the Holy Spirit is God Himself. This passage emphasizes that when we pretend to trust Christ while secretly holding onto our works or efforts for salvation, we are not just deceiving men but defying God. The consequence for Ananias and Sapphira, who tried to present an image of complete surrender while clinging to part of their profits, was severe. This serves as a warning that salvation is through total reliance on Christ alone.