Deepertruth: Eucharistic Miracles with Dr. Gregory Thompson and John Carpenter

MARIUS THE MAGNESIAN

"[Christ] took the bread and the cup, each in a similar fashion, and said: 'This is My Body and this is My Blood.' Not a figure of His body nor a figure of His blood, as some persons of petrified mind are wont to rhapsodize, but in truth the Body and the Blood of Christ, seeing that His body is from the earth, and the bread and wine are likewise from the earth."
-"Apocriticus" [3,23] ca. 400 A.D.

ST. LEO I, THE GREAT
  
"When the Lord says: 'Unless you shall have eaten the flesh of the Son of Man and shall have drunk His blood, you shall not have life in you,' you ought to so communicate at the Sacred Table that you have no doubt whatever of the truth of the Body and the Blood of Christ. For that which is taken in the mouth is what is believed in faith; and in do those respond, 'Amen,' who argue against that which is received."
-"Sermons" [91,3] ante 461 A.D.
 

ST. CAESARIUS OF ARLES

"As often as some infirmity overtakes a man, let him who is ill receive the Body and Blood of Christ."
-"Sermons [13 (265), 3]