Do you still not perceive? Do you not remember the five loaves for the five thousand, and how many baskets you gathered?
Or the seven loaves for the four thousand, and how many baskets you gathered?
How could you fail to perceive that I was not speaking about bread? Beware of the yeast of the Pharisees and Sadducees!"
Then they understood that he had not told them to beware of the yeast of bread, but of the teaching of the Pharisees and Sadducees.
Now when Jesus came into the district of Caesarea Philippi, he asked his disciples, "Who do people say that the Son of Man is?"
And they said, "Some say John the Baptist, but others Elijah, and still others Jeremiah or one of the prophets."
He said to them, "But who do you say that I am?"
Simon Peter answered, "You are the Messiah, the Son of the living God."
References for Matthew 16:16
And Jesus answered him, "Blessed are you, Simon son of Jonah! For flesh and blood has not revealed this to you, but my Father in heaven.
And I tell you, you are Peter, and on this rock I will build my church, and the gates of Hades will not prevail against it.
References for Matthew 16:18
I will give you the keys of the kingdom of heaven, and whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven."