Irenaeus of Lyons, Against Heresies 3.1
We have come to know the plan of our salvation through those who brought the Gospel to us. They first proclaimed it by word, then, by God's will, handed it down to us in the Scriptures, which were to become the foundation and pillar of our faith. It is not right to claim that they preached before they possessed full knowledge, as some presumptuously assert, boasting that they are correctors of the Apostles. For after our Lord rose from the dead, and they were clothed with power from on high when the Holy Spirit came upon them, they were filled with all things and attained perfect knowledge. They went out to the ends of the earth, preaching the good things that come to us from God and proclaiming heavenly peace to all people, each of them bearing the Gospel of God. Thus Matthew produced a written Gospel in the Hebrews' own language, while Peter and Paul were evangelizing in Rome and laying the foundations of the Church. After their departure, Mark, the disciple and interpreter of Peter, handed down to us in writing what had been announced by Peter. Luke, a follower of Paul, set down in a book the Gospel that Paul preached. Later, John, the disciple of the Lord who had leaned on His breast, published his Gospel while living at Ephesus in Asia. All of them proclaimed to us one God, the Maker of heaven and earth, announced by the Law and the Prophets, and one Christ, the Son of God. If anyone does not assent to them, he despises the Lord's companions, he despises Christ the Lord, he despises the Father, and he condemns himself by resisting and opposing his own salvation. This is what all heretics do.
Latin
1. Now enim per alios dispositionem salutis nostree cognovimus, quam per eos per quos Evangelium pervenit ad nos: quod quidem tune preeconayerunt, postea vero per Dei voluntatem in Seripturis nobis tradiderunt, fundamentum et columnam fidei nostree futurum. Nec enim fas est dicere, quoniam ante preedicaverunt quam perfectam haberent agnitionem; sicut quidam audent dicere, gloriantes emendatores se esse Apostolorum. Postea enim quam surrexit Dominus noster a mortuis, et induti sunt supervenientis Spiritus sancti virtutem ex alto, de omnibus adimpleti sunt, et habuerunt perfectam agnitionem; exierunt in fines terree, ea quee a Deo nobis bona sunt evangelizantes, et ccelestem pacem hominibus annuntiantes, qui quidem et omnes pariter et singuli eorum habentes Evangelium Dei*. Ita Mattheus in Hebreis ipsorum lingua scripturam y. edidit Evangelii, cum Petrus et Paulus Rome evangelizarent, et ecxdyoiav. Mera de trav fundarent Ecclesiam. Post vero horum excessum, Marcus discipulus et interpres Petri, et ipse quee a Petro annuntiata erant, per ———— seripta nobis tradidit. Et Lucas autem sectator Pauli, quod ab illo preedicabatur Evangelium, in libro condidit. Postea et Johannes discipulus Domini, qui et supra pectus ejus recumbebat, et ipse edidit Evangelium, Ephesi Asie commorans. Et omnes isti unum Deum factorem cceli et terre a lege et prophetis annuntiatum, et unum Christum filium Dei tradiderunt nobis: quibus si quis non assentit, spernit quidem participes Domini, spernit autem et ipsum Christum Dominum, spernit vero et Patrem, et est a semetipso damnatus, resistens et repugnans saluti suze: quod faciunt omnes heeretici.