How do we know that Joseph's story points to Christ?

Joseph’s life is filled with betrayal, suffering, and ultimate vindication, paralleling the life of Christ. Joseph was sold by his brothers, much like Christ was betrayed by Judas. Both were raised to a position of authority after enduring trials. The narrative in Genesis specifically portrays Joseph as a provider for his people, symbolizing how Christ provides spiritual nourishment and salvation for His people. Just as Joseph gathered sustenance during the years of plenty for the coming famine, Christ has prepared a place of eternal nourishment for His followers.