Mark 8:27-30

And Jesus went out, and his disciples, into the towns of Cæsarea Philippi: and by the way he asked his disciples, saying unto them, Whom do men say that I am? And they answered, John the Baptist: but some say, Elias; and others, One of the prophets. And he saith unto them, But whom say ye that I am? And Peter answereth and saith unto him, Thou art the Christ. And he charged them that they should tell no man of him.