Many passages in the Bible point to life after death.
Jesus taught about the afterlife throughout his ministry. Jesus' 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 gave his only Son so that humanity could have eternal life.
For God so loved the world that he gave his only Son, so that everyone who believes in him may not perish but may have eternal life.John 3:16