From that time on Jesus began to explain to his disciples that he must go to Jerusalem and suffer many things at the hands of the elders, the chief priests and the teachers of the law, and that he must be killed and on the third day be raised to life.
References for Matthew 16:21
Peter took him aside and began to rebuke him. “Never, Lord!” he said. “This shall never happen to you!”
Jesus turned and said to Peter, “Get behind me, Satan! You are a stumbling block to me; you do not have in mind the concerns of God, but merely human concerns.”
References for Matthew 16:23