St. Justin Martyr, First Apology, 66 (c. A.D.  110-165): “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.”