7th Century
Portrait of St. Isidore of Seville

St. Isidore of Seville

Late Patristic
"

The bread, because it strengthens the body, is thus called the body of Christ. The wine, because it acts on the blood in the body, is therefore referred to as the blood of Christ. However, although these things are visible, nevertheless, sanctified through the Holy Spirit, they pass over into the sacrament of the divine body. "

On Ecclesiastical Offices View Source