5th Century
St. Augustine of Hippo
Patristic Period
St. Augustine of Hippo (354 – 430), Bishop of Hippo and Doctor of the Church. Wikipedia
"You ought to know what you have received, what you are about to receive, what you ought to receive every day. That bread which you can see on the altar, sanctified by the word of God, is the body of Christ. That cup, or rather what the cup contains, sanctified by the word of God, is the blood of Christ. "
Sermon 227
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Why this quote matters
Augustine's catechetical instruction on the Eucharistic elements.
Source citation: Sermon 227.