13 When Jesus arrived in the villages of Caesarea Philippi, he asked his disciples, "What are people saying about who the Son of Man is?" 14 They replied, "Some think he is John the Baptizer, some say Elijah, some Jeremiah or one of the other prophets." 15 He pressed them, "And how about you? Who do you say I am?" 16 Simon Peter said, "You're the Christ, the Messiah, the Son of the living God." 17 Jesus came back, "God bless you, Simon, son of Jonah! You didn't get that answer out of books or from teachers. My Father in heaven, God himself, let you in on this secret of who I really am. 18 And now I'm going to tell you who you are, really are. You are Peter, a rock. This is the rock on which I will put together my church, a church so expansive with energy that not even the gates of hell will be able to keep it out. 19 "And that's not all. You will have complete and free access to God's kingdom, keys to open any and every door: no more barriers between heaven and earth, earth and heaven. A yes on earth is yes in heaven. A no on earth is no in heaven." 20 He swore the disciples to secrecy. He made them promise they would tell no one that he was the Messiah.
Matthew Henry's Commentary on Matthew 16:13-20
Commentary on Matthew 16:13-20
(Read Matthew 16:13-20)
Peter, for himself and his brethren, said that they were assured of our Lord's being the promised Messiah, the Son of the living God. This showed that they believed Jesus to be more than man. Our Lord declared Peter to be blessed, as the teaching of God made him differ from his unbelieving countrymen. Christ added that he had named him Peter, in allusion to his stability or firmness in professing the truth. The word translated "rock," is not the same word as Peter, but is of a similar meaning. Nothing can be more wrong than to suppose that Christ meant the person of Peter was the rock. Without doubt Christ himself is the Rock, the tried foundation of the church; and woe to him that attempts to lay any other! Peter's confession is this rock as to doctrine. If Jesus be not the Christ, those that own him are not of the church, but deceivers and deceived. Our Lord next declared the authority with which Peter would be invested. He spoke in the name of his brethren, and this related to them as well as to him. They had no certain knowledge of the characters of men, and were liable to mistakes and sins in their own conduct; but they were kept from error in stating the way of acceptance and salvation, the rule of obedience, the believer's character and experience, and the final doom of unbelievers and hypocrites. In such matters their decision was right, and it was confirmed in heaven. But all pretensions of any man, either to absolve or retain men's sins, are blasphemous and absurd. None can forgive sins but God only. And this binding and loosing, in the common language of the Jews, signified to forbid and to allow, or to teach what is lawful or unlawful.