The following is from GotQuestions.org:
Is there an afterlife?"
The book of Job asks the question about an afterlife very simply: “If a man dies, will he live again?” (Job 14:14). Asking the question is easy, but the difficult part is finding someone to answer the question with authority and experience. “Death and taxes” have said to be the two universals that everyone living can expect to deal with. But while everyone is handled somewhat differently by government taxation, death is the great equalizer that treats everyone the same.
Because of this, it’s not uncommon for people to be afraid of death. [...] the fear of death remains fixed in many people. The book of Job describes death as the “king of terrors” (Job 18:14). This fact is visible in the movieThe Bucket List when the character played by Jack Nicholson, trying to come to grips with dying, says, “We all want to go on forever, don’t we? We fear the unknown. Everybody goes to that wall, yet nobody knows what’s on the other side. That’s why we fear death.”
But one person has gone to that wall, gone through to the other side, and come back to tell us what to expect. He alone possesses the authority and knowledge to tell everyone the truth about the afterlife.