Blasphemy is an insult that shows contempt, disrespect or lack of reverence concerning a deity, an object considered sacred, or something that is considered inviolable. Some religions, especially Abrahamic ones, regard blasphemy as a crime, including insulting the Islamic prophet Muhammad in Islam, speaking the sacred name in Judaism, and blasphemy of God's Holy Spirit, which is an eternal sin in Christianity. It was also a crime under English common law, and it is still a crime under Italian law.