1. Acts 5:4 (ESV)
  2. Exposition

Did Ananias blaspheme the Holy Spirit?

Acts 5:4 (ESV)

4 While it remained unsold, did it not remain your own? And after it was sold, was it not at your disposal? Why is it that you have contrived this deed in your heart? You have not lied to man but to God.”

The primary sin in view is not blasphemy against the Holy Spirit (attributing the works of Satan to God as in Luke 12:10), but lying to the Holy Spirit. Deception, a transgression of the ninth commandment.