Matthew 16:15-17, 20

He *said to them, “But who do you say that I am?” Simon Peter answered, “You are the Christ, the Son of the living God.” And Jesus said to him, “Blessed are you, Simon Barjona, because flesh and blood did not reveal this to you, but My Father who is in heaven.

Then He warned the disciples that they should tell no one that He was the Christ.