It's true. Early Christians believed that the bread and wine used in the Eucharist were transformed into the body and blood of Christ.
The Real Presence is taught by St. Paul. “For as often as you eat this bread and drink the cup, you proclaim the Lord’s death until he comes. Whoever, therefore, eats the bread or drinks the cup of the Lord in an unworthy manner will be guilty of profaning the body and blood of the Lord” (1 Corinthians 11:26-27).
The Real Presence was taught by the twelve apostles. “Let no one eat and drink of your Eucharist but those baptized in the name of the Lord; to this, too the saying of the Lord is applicable: ‘Do not give to dogs what is sacred” (Teaching of the Twelve Apostles, or Didache, 9:5).
The Real Presence was upheld by early Christians.
It was upheld by St. Ignatius of Antioch in the first century: “Consider how contrary to the mind of God are the heterodox in regard to the grace of God which has come to us . . . They abstain from the Eucharist and from prayer, because they do not admit that the Eucharist is the flesh of our Savior Jesus Christ, the flesh which suffered for our sins and which the Father, in His graciousness, raised from the dead.” (St. Ignatius of Antioch, Letter to the Smyrnaeans, circa 90 AD).
It was upheld by St. Justin Martyr in the second century: “This food we call the Eucharist, of which no one is allowed to partake except one who believes that the things we teach are true, and has received the washing for forgiveness of sins and for rebirth, and who lives as Christ handed down to us. For we do not receive these things as common bread or common drink; but as Jesus Christ our Savior being incarnate by God’s Word took flesh and blood for our salvation, so also we have been taught that the food consecrated by the Word of prayer which comes from him, from which our flesh and blood are nourished by transformation, is the flesh and blood of that incarnate Jesus” (St. Justin Martyr, First Apology, circa 150 AD).
It was upheld by St. Clement of Alexandria in the third century: “The one, the Watered Wine, nourishes in faith, while the other, the Spirit, leads us on to immortality. The union of both, however, – of the drink and of the Word, – is called the Eucharist, a praiseworthy and excellent gift. Those who partake of it in faith are sanctified in body and in soul. By the will of the Father, the divine mixture, man, is mystically united to the Spirit and to the Word” (St. Clement of Alexandria, The Instructor of the Children, circa 202 AD).
It was upheld by St. Cyril of Jerusalem in the fourth century: “Since then He Himself has declared and said of the Bread, (This is My Body), who shall dare to doubt any longer? And since He has affirmed and said, (This is My Blood), who shall ever hesitate, saying, that it is not His blood?” (St. Cyril of Jerusalem, Catechetical Lectures, circa 350 AD).
Transubstantiation, wherein bread and wine change into the Body and Blood of Christ in the eucharist has been part of Catholicism since the very beginning..
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