What does the Bible say about salvation being eternal?

The concept of eternal salvation is rooted in the assurance that once a person is saved, they cannot lose that salvation. Hebrews 10:14 states, 'For by one offering He hath perfected forever them that are sanctified.' This means that Christ's sacrifice was sufficient and effective, allowing believers to have confidence in their eternal security. Furthermore, in John 10:28-29, Jesus mentions that no one can snatch His sheep out of His hand, affirming that true believers have a secure standing before God.