'Second Death' in the Bible

He who has an ear, let him hear what the Spirit says to the congregations. He who overcomes will, no, not be hurt from the second death.

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

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

But for the cowards, and unbelieving, and sinful, and abominable, and murderers, and fornicators, and sorcerers, and idolaters, and all liars, their part is in the lake that burns with fire and brimstone, which is the second death.