Mark 8:27-30 King James Version (KJV)
27 And Jesus went out, and his disciples, into the towns of Caesarea Philippi: and by the way he asked his disciples, saying unto them, Whom do men say that I am?
28 And they answered, John the Baptist; but some say, Elias; and others, One of the prophets.
29 And he saith unto them, But whom say ye that I am? And Peter answereth and saith unto him, Thou art the Christ.
30 And he charged them that they should tell no man of him.