'Second Death' in the Bible

He who has an ear, let him hear what the Spirit says to the churches. He who overcomes will not be hurt at all by the second death.'

Blessed and holy is the one who has a part in the first resurrection; over these the second death has no power, but they will be priests of God and of Christ and will reign with him for a thousand years.

Then death and Hades were thrown into the lake of fire. This is the second death, the lake of fire.

But as for the cowardly, the unbelieving, the immoral, as for murderers, fornicators, sorcerers, idolaters, and all liars, their lot will be in the lake that burns with fire and sulfur, which is the second death."