Evidence Matthew 16: 16 – 19 is an Interpolation

In Matt 16:13 – 20 Now when Jesus came into the district of Caesarea Philippi, He was asking His disciples, “Who do people say that the Son of Man is?” And they said, “Some [say] John the Baptist; and others, Elijah; but still others, Jeremiah, or one of the prophets.” 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. “I also say to you that you are Peter, and upon this rock I will build My church; and the gates of Hades will not overpower it. “I will give you the keys of the kingdom of heaven; and whatever you bind on earth shall have been bound in heaven, and whatever you loose on earth shall have been loosed in heaven.” Then He warned the disciples that they should tell no one that He was the Christ.

The same account in Mark 8:27 – 30 excludes “. . .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. “I also say to you that you are Peter, and upon this rock I will build My church; and the gates of Hades will not overpower it. “I will give you the keys of the kingdom of heaven; and whatever you bind on earth shall have been bound in heaven, and whatever you loose on earth shall have been loosed in heaven.”

In Luke 9:18 – 21 instead of Peter answering “you are the Messiah” he said “the Messiah of God”, and excludes “. . .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. “I also say to you that you are Peter, and upon this rock I will build My church; and the gates of Hades will not overpower it. “I will give you the keys of the kingdom of heaven; and whatever you bind on earth shall have been bound in heaven, and whatever you loose on earth shall have been loosed in heaven.”

This supports that the text of Matt 16: 16 – 19 was added at a later date.