The earliest known post-Bible reference to this phenomenon is from Ignatius of Antioch's 106 AD Epistle to the Smyrneans.  
The earliest known post-Bible reference to this phenomenon is from Ignatius of Antioch's 106 AD Epistle to the Smyrneans.  Based on Matthew 26:26-28 and John 6:53, in the Eastern Orthodox church, it is known as "metabole" or "metavole."  Officially codified into dogma by the 1215 Fourth Lateran Council and reaffirmed at the Council of Trent in opposition to the Protestant belief of "commemoration," FTP what is this Catholic belief that the Eucharist becomes the body and blood of Christ?
The earliest known post-Bible reference to this phenomenon is from Ignatius of Antioch's 106 AD Epistle to the Smyrneans.  
transubstantiation