1 John 5:16
If any one see his brother sinning a sin, not to death, let him ask, and he will grant to him life, for those who sin not to death. There is a sin leading to death. I do not say concerning it, that you should ask.
Revelation 2:11
Whoever has an ear, let him hear what the Spirit says to the congregations. The conqueror shall not be injured by the second death.
Revelation 20:6
Happy and holy is he who has a part in the first resurrection! on such, the second death shall have no power; but they shall be the priests of God, and of Christ: and they shall reign with him a thousand years.
Revelation 20:14
And death and hades were cast into the lake of fire: this is the second death.
Revelation 21:8
But, as for the cowards, and unbelieving, and the abominable, and murderers, and prostitutes, and sorcerers, and idolaters, and all liars-their part shall be in the lake which burns with fire and brimstone, which is the second death.