What does the Bible say about the mark of the beast?

The mark of the beast is found in Revelation 13 and symbolizes humanity's reliance on earthly power and false religion, which draws people away from faith in Christ. It manifests in various forms throughout history, such as the Judaizers demanding physical marks for acceptance or governments enforcing compliance to escape persecution. The true significance lies in how people trust in their own works or worldly systems for salvation, instead of Christ's redemptive work. The number of the beast, 666, signifies failure, representing mankind's sinful nature and effort to usurp God's authority.