Matthew 16:15-17, 20

“But you,” He asked them, “who do you say that I am? ” Simon Peter answered, “You are the Messiah, the Son of the living God! ” And Jesus responded, “Simon son of Jonah, you are blessed because flesh and blood did not reveal this to you, but My Father in heaven.

And He gave the disciples orders to tell no one that He was the Messiah.