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, chief priests and teachers of the law, and that He must be killed and on the third day be raised to life. 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 things of God, but the things of men.” (Matthew 16:21-23)
Just moments before, Peter had responded to Jesus’ question, “Who do you say that I am?” with his great confession that Jesus is the Messiah. Jesus had blessed Peter, called him the “rock” on which the church would be built, and given him the keys of the kingdom. What an affirmation!