R.T. France
Not only is Peter to have a leading role, but this role involves a daunting degree of authority (though not an authority which he alone carries, as may be seen from the repetition of the latter part of the verse in 18:18 with reference to the disciple group as a whole). The image of ‘keys’ (plural) perhaps suggests not so much the porter, who controls admission to the house, as the steward, who regulates its administration (cf. Is 22:22, in conjunction with 22:15). The issue then is not that of admission to the church . . . , but an authority derived from a ‘delegation’ of God’s sovereignty. (R.T. France; in Morris, Leon, Gen. ed., Tyndale New Testament Commentaries, Leicester, England: Inter-Varsity Press / Grand Rapids, MI: Eerdmans Pub. Co., 1985, vol. 1: Matthew, 256)
Oscar Cullman
Just as in Isaiah 22:22 the Lord puts the keys of the house of David on the shoulders of his servant Eliakim, so does Jesus hand over to Peter the keys of the house of the kingdom of heaven and by the same stroke establishes him as his superintendent. There is a connection between the house of the Church, the construction of which has just been mentioned and of which Peter is the foundation, and the celestial house of which he receives the keys. The connection between these two images is the notion of God’s people. (Oscar Cullmann, Peter: Disciple, Apostle, Martyr, Neuchatel: Delachaux & Niestle, 1952 French ed., 183-184)
Raymond Brown, Karl Donfried and John Reumann
The prime minister, more literally ‘major-domo,’ was the man called in Hebrew ‘the one who is over the house,’ a term borrowed from the Egyptian designation of the chief palace functionary . . .
The power of the key of the Davidic kingdom is the power to open and to shut, i.e., the prime minister’s power to allow or refuse entrance to the palace, which involves access to the king . . . Peter might be portrayed as a type of prime minister in the kingdom that Jesus has come to proclaim . . . What else might this broader power of the keys include? It might include one or more of the following: baptismal discipline; post-baptismal or penitential discipline; excommunication; exclusion from the eucharist; the communication or refusal of knowledge; legislative powers; and the power of governing. (Peter in the New Testament, Brown, Raymond E., Karl P. Donfried and John Reumann, editors, Minneapolis: Augsburg Pub. House/New York: Paulist Press, 1973, 96-97. Common statement by a panel of eleven Catholic and Lutheran scholars)
Theological Dictionary of the New Testament
In biblical and Judaic usage handing over the keys does not mean appointment as a porter but carries the thought of full authorization (cf. Mt. 13:52; Rev. 3:7) . . . The implication is that Jesus takes away this authority from the scribes and grants it to Peter. (J. Jeremias, in Theological Dictionary of the New Testament, Gerhard Kittel, abridgement of Geoffrey W. Bromiley, Grand Rapids, MI: Eerdmans, 1985, 440)
All these New Testament pictures and usages go back to a picture in Isaiah (Is 22:22) . . . Now the duty of Eliakim was to be the faithful steward of the house . . . So then what Jesus is saying to Peter is that in the days to come, he will be the steward of the Kingdom. (William Barclay, Gospel of Matthew, Philadelphia: Westminster Press, 1975, vol. 2, 144-145)
Isa 22:15 ff. undoubtedly lies behind this saying . . . The keys are the symbol of authority . . . the same authority as that vested in the vizier, the master of the house, the chamberlain, of the royal household in ancient Israel. Eliakim is described as having the same authority in Isaiah. (William F. Albright and C.S. Mann, Anchor Bible: Matthew, Garden City, NY: Doubleday, 1971, 196)
And what about the “keys of the kingdom”? . . . About 700 B.C. an oracle from God announced that this authority in the royal palace in Jerusalem was to be conferred on a man called Eliakim . . . (Isa. 22:22). So in the new community which Jesus was about to build, Peter would be, so to speak, chief steward. (F.F. Bruce, The Hard Sayings of Jesus, Downers Grove, IL: Intervarsity Press, 1983, 143-144)