What does the Bible say about falling away from the faith?

Hebrews 6:4-6 describes a serious warning regarding those who have tasted the heavenly gift but later fall away. Such a state denotes a significant departure from the faith, and the text makes it clear that it is impossible for those who have experienced these spiritual truths to be renewed to repentance if they turn away. This serves as a sobering reminder of the gravity of abandoning one's faith, especially considering the high cost of Christ's sacrifice, as it's akin to putting Him to an open shame.