"His mission is that he has to be put to death by the Romans to suffer so his blood will be the sign for redemption to come. This is the sign of the son of Joseph. This is the conscious view of Jesus himself. This gives the Last Supper an absolutely different meaning. To shed blood is not for the sins of people but to bring redemption to Israel," - Israel Knohl, professor of Bible studies at Hebrew University in Jerusalem.
I'm not expert enough to judge the scholarship but the piece is fascinating. Any evidence that the meme of a Jewish savior having to suffer for the sins of Israel and rise after three days pre-dated Jesus is a big deal.