Jesus taught that men ought to fear the One who “has power to cast into hell” (Luke 12:5). God the Father has given His Son Jesus authority to execute all judgment (John 5:22, 27). “All will appear before the judgment of seat of Christ” (2 Cor. 5:10). So, Christ has the authority to justly cast a soul into hell.
The word hell is a translation of the Greek word gehenna. Gehenna is not the same thing as hades or sheol, which is the place where the spirit goes upon death to wait for the final judgment. Hell is the eternal place prepared for God’s adversary, the devil, and his angels (Matt. 25:41). The Lord described hell as an everlasting fire (Matt. 25:8-9), where there is wailing and gnashing of teeth (13:42). It is also outer darkness (25:30) – a darkness which is the result of being “punished with everlasting destruction from the presence of the Lord” (2 Thess. 1:9). Hell is no joke. It is real, as real as judgment itself. Jesus promised to prepare for His faithful disciples a place with Him in His Father’s house. Likewise, an eternal place away from the Lord is prepared for unbelievers and the disobedient.
The devil with his host will be tormented day and night in the lake of fire forever and ever (Rev. 20:10). That lake of fire is hell, where the devil will be cast. “The cowardly, unbelieving, abominable, murderers, sexually immoral, sorcerers, idolaters, and all liars” will be cast into hell, too (Rev. 21:8). Destruction in hell is not a loss of being or a ceasing of existence, but rather, it is the loss of the well-being of the soul and spirit. All who do not know God and practice lawlessness will be punished in hell (Matt. 7:23; 13:41; 2 Thess. 1:8).