On the one hand, the Bible teaches that “it is appointed unto men once to die” (Heb. 9:27). The physical death of the physical body is a certainty for all of us. But did you know that Jesus taught a way to “never die”? Would you like to know it? At the tomb of Lazarus, Jesus said, “Whoever lives and believes in Me shall never die” (John 11:26). 
What did He mean by that?
When someone’s body dies, that is just the “tent” (2 Pet. 1:13-14) in which he was living. At death, “the spirit” does not expire but leaves the body for another realm (Jas. 2:26; Luke 16:22-23). What happens to that spirit at the moment of physical death is determined by the faith and life of the individual. John taught, “He who does the will of God abides forever” (1 John 2:17).
For a faithful Christian who “believes” and “does the will of God” in this life, death of the physical body is simply a transition from life on this earth to life in a much better place. He will keep right on living (i.e., never dying spiritually) and now in the presence of God!