Mark 8:27-30

27And Jesus went forth and his disciples, into the villages of Caesarea-Philippi. And by the way he asked his disciples, saying unto them, Who do men say that I am?

28And they answered him, saying, John the baptist; and others, Elias; but others, One of the prophets.

29And he asked them, But ye, who do ye say that I am? And Peter answering says to him, Thou art the Christ.

30And he charged them straitly, in order that they should tell no man about him.