Ambrose of Milan, on 1Cor 11:24

“And giving thanks, broke, and said: Take ye, and eat: this is my body, which shall be delivered for you: this do for the commemoration of me.”

“Do you want to know why it is consecrated with heavenly words? Receive the words. The priest says: 'Make this offering written, ratified, reasonable, acceptable, which is the figure of the body and blood of our Lord Jesus Christ. Who, on the day before he suffered, took bread into his holy hands, looked up to you, holy Father almighty, eternal God, giving thanks, he blessed it, broke it, and gave it to his apostles and disciples, saying: Take and eat all of you from this; for this is my body which will be broken for many.' He took bread in his holy hands the day before he suffered. Before it is consecrated, it is bread; but when the words of Christ have been spoken, it becomes the body of Christ. And before the words of Christ, the cup is full of wine and water: when the words of Christ have been spoken, there the blood of Christ is made, which redeemed the people.”

Imported from an open dataset — not yet checked against the printed edition.