The Doctrine of Death

Death means separation, not cessation or annihilation of life.  When Adam ate the forbidden fruit, he died spiritually in that his relationship with God was severed and he was in danger of the Lake of Fire which God had prepared for the Devil and his angels (Matt. 25:41).  Even though Adam was made spiritually alive again (Gen. 3:21), he died physically at a later time in his life (Gen. 5:5).