This is referred to in scripture under various aspects.
1. The general appointment for sinful man—the death of the body by the separation of the soul from it (Heb. 9:27; Rom. 5:14; Rom. 6:23).
2. The spiritual condition of fallen man, “dead in trespasses and sins” (Eph. 2:1,5; Rom. 7:24).
3. Death personified as a power of Satan: the last enemy to be destroyed (1 Cor. 15:26; Rev. 20:13-14).
4. THE SECOND DEATH: eternal punishment (Rev. 2:11; Rev. 20:14; Rev. 21:8).