My easiest place to refer you to is the following which references Scripture, the following ECF’s and early Church:
1 Cor. 10:16–17, 11:23–29; and, most forcefully, John 6:32–71).
Ignatius, Irenaeus, Hippolytus, Tertullian, Ignatius of Antioch, Justin Martyr, Clement of Alexandria, Origen, Cyprian of Carthage, Council of Nicaea I, Aphraahat the Persian Sage, Cyril of Jerusalem, Ambrose of Milan, Theodore of Mopsuestia, Augustine, and Council of Ephesus. All of these teachings were before the canonization of the Bible.
catholic.com/library/Real_Presence.asp