Revelation 20:14

14 Then death and Hades were thrown into the lake of fire. The lake of fire is the second death.

Read Revelation 20:14 Using Other Translations

And death and hell were cast into the lake of fire. This is the second death.
Then Death and Hades were thrown into the lake of fire. This is the second death, the lake of fire.
Then death and the grave were thrown into the lake of fire. This lake of fire is the second death.