We could look at the Didache or Clement of Rome, but we need to be clear on RP---it is the teaching that the duly ordained priest at the altar saying the right words changes the bread into flesh.
Did I get that right or not?
The Confessional Lutheran perspective; from the Large Catechism:
http://www.bookofconcord.org/lc-7-sacrament.php#para4
4] Here also we do not wish to enter into controversy and contend with the traducers and blasphemers of this Sacrament, but to learn first (as we did regarding Baptism) what is of the greatest importance, namely, that the chief point is the Word and ordinance or command of God. For it has not been invented nor introduced by any man, but without any one's counsel and deliberation it has been instituted by Christ. 5] Therefore, just as the Ten Commandments, the Lord's Prayer, and the Creed retain their nature and worth, although you never keep, pray, or believe them, so also does this venerable Sacrament remain undisturbed, so that nothing is detracted or taken from it, even though we employ and dispense it unworthily. 6] What do you think God cares about what we do or believe, so that on that account He should suffer His ordinance to be changed? Why, in all worldly matters every thing remains as God has created and ordered it, no matter how we employ or use it. 7] This must always be urged, for thereby the prating of nearly all the fanatical spirits can be repelled. For they regard the Sacraments, aside from the Word of God, as something that we do.
From the Formula of Concord, Epitome:
http://www.bookofconcord.org/fc-ep.php#part7.8
8] 3. Now, as to the consecration, we believe, teach, and confess that no work of man or recitation of the minister [of the church] produces this presence of the body and blood of Christ in the Holy Supper, but that this is to be ascribed only and alone to the almighty power of our Lord Jesus Christ. 9] 4. But at the same time we also believe, teach, and confess unanimously that in the use of the Holy Supper the words of the institution of Christ should in no way be omitted, but should be publicly recited, as it is written 1 Cor. 10:16: The cup of blessing which we bless, etc. This blessing occurs through the recitation of the words of Christ.
And the Formula of Concord, Solid Declaration:
73] Since a misunderstanding and dissension among some teachers of the Augsburg Confession also has occurred concerning consecration and the common rule, that nothing is a sacrament without the appointed use [or divinely instituted act], we have made a fraternal and unanimous declaration to one another also concerning this matter to the following purport, 74] namely, that not the word or work of any man produces the true presence of the body and blood of Christ in the Supper, whether it be the merit or recitation of the minister, or the eating and drinking or faith of the communicants; but all this should be ascribed alone to the power of Almighty God and the word, institution, and ordination of our Lord Jesus Christ. 75] For the true and almighty words of Jesus Christ which He spake at the first institution were efficacious not only at the first Supper, but they endure, are valid, operate, and are still efficacious [their force, power, and efficacy endure and avail even to the present], so that in all places where the Supper is celebrated according to the institution of Christ, and His words are used, the body and blood of Christ are truly present, distributed, and received, because of the power and efficacy of the words which Christ spake at the first Supper. For where His institution is observed and His words are spoken over the bread and cup [wine], and the consecrated bread and cup [wine] are distributed, Christ Himself, through the spoken words, is still efficacious by virtue of the first institution, through His word, which He wishes to be there repeated. 76] As Chrysostom says (in Serm. de Pass.) in his Sermon concerning the Passion: Christ Himself prepared this table and blesses it; for no man makes the bread and wine set before us the body and blood of Christ, but Christ Himself who was crucified for us. The words are spoken by the mouth of the priest, but by God's power and grace, by the word, where He speaks: "This is My body," the elements presented are consecrated in the Supper. And just as the declaration, Gen. 1:28: "Be fruitful, and multiply, and replenish the earth," was spoken only once, but is ever efficacious in nature, so that it is fruitful and multiplies, so also this declaration ["This is My body; this is My blood"] was spoken once, but even to this day and to His advent it is efficacious, and works so that in the Supper of the Church His true body and blood are present.
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