Daniel 12:2 and later Jewish expectation provide the background for final resurrection.
Daniel 12:2; Isaiah 25:8; Isaiah 26:19 are important backgrounds.
Jesus does not merely claim knowledge about resurrection or power delegated for one miracle. He identifies himself personally as resurrection and life.
The claim gathers John 5 and 6 into a concise declaration that final life is located in Jesus himself.
Martha confesses Jesus as the Christ and Son of God who comes into the world.