Treasury of Scripture Knowledge

Summary

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

Bible References

This

Revelation 20:6
Blessed (happy, prosperous, to be admired) and holy is the person who takes part in the first resurrection; over these the second death [which is eternal separation from God, the lake of fire] has no power or authority, but they will be priests of God and of Christ and they will reign with Him a thousand years.
Revelation 21:8
But as for the cowards and unbelieving and abominable [who are devoid of character and personal integrity and practice or tolerate immorality], and murderers, and sorcerers [with intoxicating drugs], and idolaters and occultists [who practice and teach false religions], and all the liars [who knowingly deceive and twist truth], their part will be in the lake that blazes with fire and brimstone, which is the second death.”

General references

Ecclesiastes 12:14
For God will bring every act to judgment, every hidden and secret thing, whether it is good or evil.
1 Corinthians 15:26
The last enemy to be abolished and put to an end is death.
Galatians 6:5
For every person will have to bear [with patience] his own burden [of faults and shortcomings for which he alone is responsible].