Many passages in the Bible point to life after death.
Jesus taught about the afterlife throughout his ministry. His three parables of the Pearl, the Net and the Mustard Seed all teach about the Kingdom of God. He also taught that his followers would have eternal life.
I am the resurrection and the life. Those who believe in me, even though they die, will live...John 11:24-25
God also sacrificed his only Son so that humanity could have eternal life.
For God so loved the world that he gave his one and only Son, that whoever believes in him shall not perish but have eternal life.John 3:16
Catholics believe that Christ’s resurrection offers proof of an afterlife. In the week before his death and resurrection, Christ tells those he meets that he will destroy the temple and rebuild it in three days (Matthew 26:61). He is later taunted with this when he is on the cross (Matthew 27:40).
Christ’s resurrection not only fulfils the prophecies, but also proves that life after death exists. The crucifixion and resurrection of Christ appears in each of the four Gospels.
But in fact Christ has been raised from the dead, the first fruits of those who have died. For since death came through a human being, the resurrection of the dead has also come through a human being; for as all die in Adam, so all will be made alive in Christ.1 Corinthians 15:20-22