John 10:7 (KJV)
7 Then said Jesus unto them again, Verily, verily, I say unto you, I am the door of the sheep.
This does not refer to the prophets, but to those who came pretending to be the pastors or guides of the people. Some have supposed that he referred to those who pretended to be the Messiah before him; but there is not evidence that any such person appeared before the coming of Jesus.