The Early Church Fathers on The Early Church Fathers recognized Oral Tradition (as taught by the Church) as being equally authoritative as written Tradition (Scripture) because they both came from the same God through the same Church. Papias
Whenever anyone came my way, who had been a follower of my seniors, I would ask for the accounts of our seniors: What did Andrew or Peter say? Or Phillip or Thomas or James or John or Matthew, or any of the Lord’s disciples? I also asked: What did Aristion and John the Presbyter, disciples of the Lord say. For, as I see it, it is not so much from books as from the living and permanent voice that I must draw profit (The Sayings of the Lord [between A.D. 115 and 140] as recorded by Eusebius, Ecclesiastical History, 3:39 [A.D. 325]). Irenaeus For even creation reveals Him who formed it, and the very work made suggests Him who made it, and the world manifests Him who ordered it. The Universal [Catholic] Church, moreover, through the whole world, has received this tradition from the Apostles (Against Heresies 2:9 [A.D. 189]). True knowledge is the doctrine of the Apostles, and the ancient constitution of the Church throughout all the world, and the distinctive manifestation of the body of Christ according to the successions of the bishops, by which they have handed down that Church which exists in every place, and has come even unto us, being guarded and preserved, without any forging of Scriptures, by a very complete system of doctrine, and neither addition nor curtailment [in truths which she believes]; and [it consists in] reading [the Word of God] without falsification, and a lawful and diligent exposition in harmony with the Scriptures, both without danger and without blasphemy… (ibid. 4:33 [A.D. 189]). Tertullian
For wherever both the true Christian rule and faith shall be shown to be, there will be the true Scriptures, and the true expositions, of all the true Christian traditions (The Prescription of Heretics 19 [A.D. 200]). Origen
Seeing there are many who think they hold the opinions of Christ, and yet some of these think differently from their predecessors, yet as the teaching of the Church, transmitted in orderly succession from the Apostles, and remaining in the churches to the present day, is still preserved, that alone is to be accepted as truth which differs in no respect from ecclesiastical and apostolic tradition (On First Principles Bk. 1 Preface 2 [circa A.D. 225]). Eusebius
While [Ignatius of Antioch] was making the journey through Asia under the strictest military guard, he strengthened the diocese in each city where he stayed by spoken sermons and exhortations, and he especially exhorted them above all to be on their guard against the heresies which then for the first time were prevalent and he urged them to hold fast to the tradition of the Apostles to which he thought it necessary, for securities sake, to give form by written testimony (Ecclesiastical History, 3:36 [A.D. 325]). Athanasius
Without prefixing Consulate, month, and day, [the Fathers] wrote concerning Easter, "It seemed good as follows," for it did then seem good that there should be a general compliance; but about the faith they wrote not, "It seemed good" but, "Thus believes the Catholic Church"; and thereupon they confessed how they believed, in order to show that their own sentiments were not novel, but Apostolic; and what they wrote down was no discovery of theirs, but is the same as was taught by the Apostles (Letter on the Councils of Ariminum and Seleucia [A.D. 359]). Basil
Of the beliefs and practices whether generally accepted or publicly enjoined which are preserved in the Church some we possess derived from written teaching; others we have received delivered to us "in mystery" by the tradition of the Apostles; and both of these in relation to true religion have the same force. And these no one will contradict; - no one, at all events, who is even moderately versed in the institutions of the Church. For were we to attempt to reject such customs as have no written authority, on the ground that the importance they possess is small, we should unintentionally injure the Gospel in these matters… (On the Holy Spirit 27 [A.D. 375]). Jerome
Don’t you know that the laying on of hands after baptism and then the invocation of the Holy Sirit is a custom of the Churches? Do you demand Scripture proof? You may find it in the Acts of the Apostles. And even if it did not rest on the authority of Scripture the consensus of the whole world in this respect would have the force of a command. For many other observances of the Churches, which are do to tradition, have acquired the authority of the written law (The Dialogue Against the Luciferians 8 [A.D. 382]). John Chrysostom
"So then brethren, stand fast, and hold the traditions which you were taught, whether by word, or by epistle of ours" (2 Thessalonians 2:15). Hence it is manifest, that they did not deliver all things by epistle, but many things also unwritten, and in like manner both the one and the other are worthy of credit. Therefore let us think the tradition of the Church also worthy of credit. It is a tradition, seek no farther (Homilies on Second Thessalonians [circa A.D. 400]). Vincent of Lerins
I have often then inquired earnestly and attentively of very many men eminent for sanctity and learning, how and by what sure and so to speak universal rule I may be able to distinguish the truth of Catholic faith from the falsehood of heretical pravity; and I have always, and in almost every instance, received an answer to this effect: That whether I or any one else should wish to detect the frauds and avoid the snares of heretics as they rise, and to continue sound and complete in the Catholic faith, we must, the Lord helping, fortify our own belief n two ways: first, by the authority of the Divine Law, and then, by the Tradition of the Catholic Church (Commonitory 2 [A.D. 434]) Theodoret
I have ever kept the faith of the Apostles undefiled… So have I learnt not only from the Apostles and the Prophets but also from the interpreters of their writings, Ignatius, Eustathius, Athanasius, Basil, Gregory, John, and the rest of the lights of the world; and before these from the holy Fathers in council at Nicaea, whose confession of the faith I preserve in its integrity, like an ancestral inheritance [styling corrupt and enemies of the truth all who dare to transgress its decrees] (Letters no. 89 [circa A.D. 443]). Copyright © 2004 StayCatholic.com
Tradition
Epiphanius of Salamis
"It is needful also to make use of tradition, for not everything can be gotten from sacred Scripture. The holy apostles handed down some things in the scriptures, other things in tradition" (Medicine Chest Against All Heresies 61:6 [A.D. 375]).
Augustine
"[T]he custom [of not rebaptizing converts] . . . may be supposed to have had its origin in apostolic tradition, just as there are many things which are observed by the whole Church, and therefore are fairly held to have been enjoined by the apostles, which yet are not mentioned in their writings" (On Baptism, Against the Donatists 5:23[31] [A.D. 400]).
"But the admonition that he [Cyprian] gives us, ‘that we should go back to the fountain, that is, to apostolic tradition, and thence turn the channel of truth to our times,’ is most excellent, and should be followed without hesitation" (ibid., 5:26[37]).
"But in regard to those observances which we carefully attend and which the whole world keeps, and which derive not from Scripture but from Tradition, we are given to understand that they are recommended and ordained to be kept, either by the apostles themselves or by plenary [ecumenical] councils, the authority of which is quite vital in the Church" (Letter to Januarius [A.D. 400]).
Athanasius
"Again we write, again keeping to the apostolic traditions, we remind each other when we come together for prayer; and keeping the feast in common, with one mouth we truly give thanks to the Lord. Thus giving thanks unto him, and being followers of the saints, ‘we shall make our praise in the Lord all the day,’ as the psalmist says. So, when we rightly keep the feast, we shall be counted worthy of that joy which is in heaven" (Festal Letters 2:7 [A.D. 330]).
"But you are blessed, who by faith are in the Church, dwell upon the foundations of the faith, and have full satisfaction, even the highest degree of faith which remains among you unshaken. For it has come down to you from apostolic tradition, and frequently accursed envy has wished to unsettle it, but has not been able" (ibid., 29).
Irenaeus
"As I said before, the Church, having received this preaching and this faith, although she is disseminated throughout the whole world, yet guarded it, as if she occupied but one house. She likewise believes these things just as if she had but one soul and one and the same heart; and harmoniously she proclaims them and teaches them and hands them down, as if she possessed but one mouth. For, while the languages of the world are diverse, nevertheless, the authority of the tradition is one and the same" (Against Heresies 1:10:2 [A.D. 189]).
"That is why it is surely necessary to avoid them [heretics], while cherishing with the utmost diligence the things pertaining to the Church, and to lay hold of the tradition of truth. . . . What if the apostles had not in fact left writings to us? Would it not be necessary to follow the order of tradition, which was handed down to those to whom they entrusted the churches?" (ibid., 3:4:1).
...
"It is possible, then, for everyone in every church, who may wish to know the truth, to contemplate the tradition of the apostles which has been made known throughout the whole world. And we are in a position to enumerate those who were instituted bishops by the apostles and their successors to our own times—men who neither knew nor taught anything like these heretics rave about.
"But since it would be too long to enumerate in such a volume as this the successions of all the churches, we shall confound all those who, in whatever manner, whether through self-satisfaction or vainglory, or through blindness and wicked opinion, assemble other than where it is proper, by pointing out here the successions of the bishops of the greatest and most ancient church known to all, founded and organized at Rome by the two most glorious apostles, Peter and Paul, that church which has the tradition and the faith which comes down to us after having been announced to men by the apostles.
"With this church, because of its superior origin, all churches must agree—that is, all the faithful in the whole world—and it is in her that the faithful everywhere have maintained the apostolic tradition" (ibid., 3:3:1–2).
Irenaeus
"As I said before, the Church, having received this preaching and this faith, although she is disseminated throughout the whole world, yet guarded it, as if she occupied but one house. She likewise believes these things just as if she had but one soul and one and the same heart; and harmoniously she proclaims them and teaches them and hands them down, as if she possessed but one mouth. For, while the languages of the world are diverse, nevertheless, the authority of the tradition is one and the same" (Against Heresies 1:10:2 [A.D. 189]).
"That is why it is surely necessary to avoid them [heretics], while cherishing with the utmost diligence the things pertaining to the Church, and to lay hold of the tradition of truth. . . . What if the apostles had not in fact left writings to us? Would it not be necessary to follow the order of tradition, which was handed down to those to whom they entrusted the churches?" (ibid., 3:4:1).
"It is possible, then, for everyone in every church, who may wish to know the truth, to contemplate the tradition of the apostles which has been made known throughout the whole world. And we are in a position to enumerate those who were instituted bishops by the apostles and their successors to our own times—men who neither knew nor taught anything like these heretics rave about.
"But since it would be too long to enumerate in such a volume as this the successions of all the churches, we shall confound all those who, in whatever manner, whether through self-satisfaction or vainglory, or through blindness and wicked opinion, assemble other than where it is proper, by pointing out here the successions of the bishops of the greatest and most ancient church known to all, founded and organized at Rome by the two most glorious apostles, Peter and Paul, that church which has the tradition and the faith which comes down to us after having been announced to men by the apostles.
"With this church, because of its superior origin, all churches must agree—that is, all the faithful in the whole world—and it is in her that the faithful everywhere have maintained the apostolic tradition" (ibid., 3:3:1–2).
Clement of Alexandria
"Well, they preserving the tradition of the blessed doctrine derived directly from the holy apostles, Peter, James, John, and Paul, the sons receiving it from the father (but few were like the fathers), came by God’s will to us also to deposit those ancestral and apostolic seeds. And well I know that they will exult; I do not mean delighted with this tribute, but solely on account of the preservation of the truth, according as they delivered it. For such a sketch as this, will, I think, be agreeable to a soul desirous of preserving from loss the blessed tradition" (Miscellanies 1:1 [A.D. 208]).
Cyprian of Carthage
"[T]he Church is one, and as she is one, cannot be both within and without. For if she is with Novatian, she was not with [Pope] Cornelius. But if she was with Cornelius, who succeeded the bishop Fabian by lawful ordination, and whom, beside the honor of the priesthood the Lord glorified also with martyrdom, Novatian is not in the Church; nor can he be reckoned as a bishop, who, succeeding to no one, and despising the evangelical and apostolic tradition, sprang from himself. For he who has not been ordained in the Church can neither have nor hold to the Church in any way" (Letters 75:3 [A.D. 253]).
BTW-The Council of Trent came along about 1200 years later and added a whole bunch of new stuff that the early fathers questioned. This is the whole problem with "tradition". There isn't any.