'Second Death' in the Bible

He having ears, let him hear what the Spirit says to the churches; He conquering should not be injured by the second death.

Happy and holy he having a part in the first rising up: over these has the second death no power, but they shall be priests of God and of Christ, and they shall reign with him a thousand years.

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

But to the cowardly, and unbelieving, and to the abominable, and murderers, and to fornicators, and charmers, and to idolaters, and to all the lying, their part in the lake burning with fire and sulphur: which is the second death,