Revelation 20:14

And death and hell were cast into the lake of fire. This is the second death.

Death and Hades personified, cast into the lake of fire, express that Christ and His people shall never more die, or be disembodied spirits. The yawning, craving Sheol, that can never be satisfied, is abolished. "In Christ ALL shall be made alive" (Romans 14:9; 1 Corinthians 15:22). The dark ABYSS and the first death are destroyed, and the "LAKE (not an abyss or sea) of fire," surrounded on all sides by Immanuel's land, substituted: wherein the second death is, admitting of no rebellion of thought, word, or deed against God, but a deep everlasting woe, shame, and irreversible separation from the saints, though in their presence and that of God. No empire of evil shall be tolerated, rivalling in extent and continuance the empire of the holy and loving God. Satan's power of rebellion must cease: for Death being the last enemy destroyed, Satan too is so (Hosea 13:14; 1 John 3:8). The continual spectacle (Revelation 14:10) of what the creature is in itself, vanity and shame (Daniel 12:2), will be one means of retaining the unfallen, ransomed universe, in its only true position of safety, humble dependence on Yahweh: it will eternally show how the God of love repels the spirits in which pride and selfishness reign. Matthew 26:24; Mark 14:21, both hint [ kalon (G2570)] that eternal forfeiture of HONOUR is the doom of the lost (Birks).

This is the second death - "the lake of fire" is added in 'Aleph (') A B, Andreas. In hell the ancient form of death, one of the enemies destroyed by Christ, shall not continue, but a death far different reigns there, 'everlasting destruction from the presence of the Lord:' an abiding testimony of Christ's victory.