Death is the effect of sin, and not a “debt of nature.” See: The Fall of Man
Therefore, since the children share in flesh and blood, He Himself likewise also partook of the same, that through death He might render powerless him who had the power of death, that is, the devil, and might free those who through fear of death were subject to slavery all their lives. —Hebrews 2:14 NASB
Physical death is but once (9:27).
…it is appointed unto men once to die, but after this the judgment… —Hebrews 9:27 KJV
It is universal.
By the sweat of your face you will eat bread, till you return to the ground, because from it you were taken; for you are dust, and to dust you shall return. Genesis 3:19 NASB
Physical death is necessary (Luke 2:28-30).
Jesus has by his own physical death taken away its sting for all His followers (1 Corinthians 15:55-57).
There is a spiritual death in trespasses and sins, i.e., the death of the soul under the power of sin (Romans 8:6; Ephesians 2:1, 3; Col. 2:13).
The Second Death
The “SECOND DEATH” (Rev. 2:11) is the everlasting perdition of the wicked (Rev. 21:8), and “second” in respect to natural or temporal physical death.
See: eternal death
Death of Christ
THE DEATH OF CHRIST is the procuring cause incidentally of all the blessings men enjoy on Earth. But specially it is the procuring cause of the actual salvation of all his people, together with all the means that lead thereto. It does not make their salvation merely possible, but certain (Matthew 18:11; Romans 5:10; 2 Corinthians 5:21; Galatians 1:4; 3:13; Ephesians 1:7; 2:16; Romans 8:32-35).
Aspects of death
Various aspects of death are represented in Scripture.
“The dust shall return to the earth as it was” (Eccl. 12:7).
“Thou takest away their breath, they die” (Psalms 104:29).
It is the dissolution of “our earthly house of this tabernacle” (2 Corinthians 5:1); the “putting off this tabernacle” (2 Peter 1:13, 14).
Being “unclothed” (2 Corinthians 5:3-4).
“Falling on sleep” (Psalms 76:5; Jeremiah 51:39; Acts 13:36; 2 Peter 3:9.
“I go whence I shall not return” (Job 10:21); “Make me to know mine end” (Psalms 39:4); “to depart” (Philippians 1:23).
The grave is represented as “the gates of death” (Job 38:17; Psalms 9:13; 107:18). The gloomy silence of the grave is spoken of under the figure of the “shadow of death” (Jeremiah 2:6).