Matthew
Matthew 16:18ESV·traditional attribution

And I tell you, you are Peter, and on this rock I will build my church, and the gates of hell shall not prevail against it.

John Calvin Reformed @genevareformer

18. And I say to thee. By these words Christ declares how highly he is delighted with the confession of Peter, since he bestows upon it so large a reward. For, though he had already given to his disciple, Simon, the name of Peter, (Matthew 10:2; John 1:42,) and had, out of his undeserved goodness, appointed him to be an apostle, yet these gifts, though...

Matthew Henry Presbyterian @wholebiblehenry

We have here a private conference which Christ had with his disciples concerning himself. It was in the coasts of Cesarea Philippi, the utmost borders of the land of Canaan northward; there in that remote corner, perhaps, there was less flocking after him than in other places, which gave him leisure for this private conversation with his disciples.

Commenting on Matthew 16:13-20

John Gill Reformed Baptist @doctorgill

And I will give unto thee the keys of the kingdom of heaven,.... By the kingdom of heaven is meant the Gospel, which comes from heaven, declares the king Messiah to be come, speaks of things concerning his kingdom, is the means of setting it up, and enlarging it, displays the riches of his grace, and gives an account of the kingdom of heaven, and...