When the Lord enquires concerning the opinion of the multitudes, all the disciples answer; but when all the disciples are asked, Peter as the mouth and head [margin note: κορυφαῖος] of the Apostles answers for all, as it follows, “Simon Peter answered and said, Thou art Christ, the Son of the living God.”
Reproduced in full. Translation: Oxford 1841 (Newman), public domain (Public domain).