All of us are sinners, and God sent Jesus, his only Son, to die for our sins. Even as we had forsaken Jesus, his own commission had never changed. Every single one of us is Barabbas, and yet God's love is almighty, and greater: in fact, heavenly.
The telling of Jesus before Pilate can be found in each of the Gospels of Matthew, Mark, Luke and John in various detail. The one used is in particular from Luke.