Ignatius, Justin Martyr, Irenaeus, and Augustine all speak to the Real Presence. Justin Martyr says “we have been taught”. Taught by the Bishops, who were taught by the Apostles, who were taught by Jesus Christ. All of which is in your bible and understood through the faith that produced it.
"They abstain from the Eucharist and from prayer, because they confess not the Eucharist to be the flesh of our Saviour Jesus Christ, which suffered for our sins, and which the Father, of His goodness, raised up again." Ignatius of Antioch, Epistle to Smyrnaeans, 7,1 (c. A.D. 110).
"For not as common bread and common drink do we receive these; but in like manner as Jesus Christ our Saviour, having been made flesh and blood for our salvation,** so likewise have we been taught**that the food which is blessed by the prayer of His word, and from which our blood and flesh by transmutation are nourished, is the flesh and blood of that Jesus who was made flesh." Justin Martyr, First Apology, 66 (c. A.D. 110-165).
“[T]he bread over which thanks have been given is the body of their Lord, and the cup His blood…” Irenaeus, Against Heresies, IV:18,4 (c. A.D. 200).
“He acknowledged the cup (which is a part of the creation) as his own blood, from which he bedews our blood; and the bread (also a part of creation) he affirmed to be his own body, from which he gives increase to our bodies.” Irenaeus, Against Heresies, V:2,2 (c. A.D. 200).
“‘And was carried in His Own Hands: ‘how carried in His Own Hands’? Because when He commended His Own Body and Blood,** He took into His Hands that which the faithful know; and in a manner carried Himself, when He said, ‘This is My Body.**’” Augustine, On the Psalms, 33:1,10 (A.D. 392-418).