The Apostles sent Peter on a mission...
Acts 8.14: Now when the apostles who were at Jerusalem heard that Samaria had received the word of God, they sent to them Peter and John:
God’s Prime Minister
7. When we understand that Christ is the true son of David who came to restore the prophetic kingdom of David, we understand that in Matthew 16, Christ, like the king of Israel, was establishing a "prime minister" among his ministers, the apostles, in the kingdom. Isaiah 22:20–22 gives insight into the ministry of the "prime minister" in ancient Israel:
In that day I will call my servant Eliakim the son of Hilkiah, and I will clothe him with your robe, and will bind your girdle on him, and will commit your authority to his hand; and he shall be a father to the inhabitants of Jerusalem and to the house of Judah. And I will place on his shoulder the key of the house of David; he shall open, and none shall shut; and he shall shut, and none shall open.
In Revelation 1:18, Jesus declares, "I have the keys of Death and Hades," then quotes this very text from Isaiah in Revelation 3:7:
And to the angel of the church in Philadelphia write: "The words of the holy one, the true one, who has the key of David, who opens and no one shall shut, who shuts and no one opens."
No Christian would deny that Jesus is the King who possesses the keys. To whom does he give the keys? To Peter!
The keys given to Peter were given to all the Apostles.
But first, please cite for me any Church Father who linked the single key given to David with the keys given to Peter.
You're into lotsa quotes...
The Keys – Evidence from the Bible
The Bible alone mentions ‘the keys’ with the person of Peter
Matthew 16:19
I will give you the keys of the kingdom of heaven; whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven."
However it is implied that ‘the keys’ were given to other Apostles
Matthew 18:18 "I tell you the truth, whatever you bind on earth will be bound in heaven, and whatever you loose on earth will be loosed in heaven."
This later verse shows all the Apostles being made equal. Jesus says this to all the Apostles. Note he is talking of binding and loosing. Although He doesn’t mention ‘the keys’ here He's using the same terms as He did when He gave the keys to Peter ; binding and loosing. How do you go about binding and loosing without the keys?
Other verses make the same implication; of power to all in heaven and on earth.
John 20:23 "If you forgive anyone his sins, they are forgiven; if you do not forgive them, they are not forgiven."
Matthew 18:19 "Again, I tell you that if two of you on earth agree about anything you ask for, it will be done for you by my Father in heaven.
Evidence from the early church
Tertullian
"What, now, (has this to do) with the Church, and) your (church), indeed, Psychic? For, in accordance with the person of Peter, it is to spiritual men that this power will correspondently appertain, either to an apostle or else to a prophet. "
On Modesty. Book VII. Chapter XXI
It is clear others will also posess the keys, those who are 'spiritual men' in accordance, as the person of Peter. It is not Peter's exclusively.
Hilary of Poitiers
“This faith it is which is the foundation of the Church; through this faith the gates of hell cannot prevail against her. This is the faith which has the keys of the kingdom of heaven. Whatsoever this faith shall have loosed or bound on earth shall be loosed or bound in heaven. This faith is the Father's gift by revelation; even the knowledge that we must not imagine a false Christ, a creature made out of nothing, but must confess Him the Son of God, truly possessed of the Divine nature
On the Trinity. Book VI.37
Augustine
“He has given, therefore, the keys to His Church, that whatsoever it should bind on earth might be bound in heaven, and whatsoever it should loose on earth might be, loosed in heaven; that is to say, that whosoever in the Church should not believe that his sins are remitted, they should not be remitted to him; but that whosoever should believe and should repent, and turn from his sins, should be saved by the same faith and repentance on the ground of which he is received into the bosom of the Church. For he who does not believe that his sins can be pardoned, falls into despair, and becomes worse as if no greater good remained for him than to be evil, when he has ceased to have faith in the results of his own repentance.”
On Christian Doctrine Book I.
Chapter 18.17 The Keys Given to the Church.
"...Peter, the first of the apostles, receive the keys of the kingdom of heaven for the binding and loosing of sins; and for the same congregation of saints, in reference to the perfect repose in the bosom of that mysterious life to come did the evangelist John recline on the breast of Christ. For it is not the former alone but the whole Church, that bindeth and looseth sins; nor did the latter alone drink at the fountain of the Lord's breast, to emit again in preaching, of the Word in the beginning, God with God, and those other sublime truths regarding the divinity of Christ, and the Trinity and Unity of the whole Godhead."
On the Gospel of John
Tractate CXXIV.7
"...the keys that were given to the Church,"
A Treatise Concerning the Correction of the Donatists
Chapter 10.45
"How the Church? Why, to her it was said, "To thee I will give the keys of the kingdom of heaven, and whatsoever thou shall loose on earth shall be loosed in heaven, and whatsoever thou shall bind on earth shall be bound in heaven."
Ten Homilies on the First Epistle of John
Homily X.10