Matthew 16:17 (KJV)

Then understood they how that he bade them not beware of the leaven of bread, but of the doctrine of the Pharisees and of the Sadducees.

When Jesus came into the coasts of Caesarea Philippi, he asked his disciples, saying, Whom do men say that I the Son of man am?

And they said, Some say that thou art John the Baptist: some, Elias; and others, Jeremias, or one of the prophets.

He saith unto them, But whom say ye that I am?

And Simon Peter answered and said, Thou art the Christ, the Son of the living God.

And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.

And I will give unto thee the keys of the kingdom of heaven: and whatsoever thou shalt bind on earth shall be bound in heaven: and whatsoever thou shalt loose on earth shall be loosed in heaven.

Then charged he his disciples that they should tell no man that he was Jesus the Christ.

From that time forth began Jesus to shew unto his disciples, how that he must go unto Jerusalem, and suffer many things of the elders and chief priests and scribes, and be killed, and be raised again the third day.

Then Peter took him, and began to rebuke him, saying, Be it far from thee, Lord: this shall not be unto thee.