Judas' 30 silver coins bought the Field of Blood in Matthew 27
Judas' 30 pieces of silver, returned in remorse after betraying Jesus, were used by the religious leaders to purchase a burial ground for outsiders, turning blood money into a prophetic sign.
Why God Gives Prophecies in Isaiah 46:9–10
God gives prophecies to demonstrate His unmatched sovereignty and control, declaring the end from the beginning to show His purposes will stand.