There is always debate about whether to use leavened bread vs unleavened bread for Holy Eucharist These arguments are based upon historical appeals in a game to justify authenticity. Both Orthodox Christians and Roman Catholics have appealed to words in scripture to defend the literal aspects for consumption of the Sacrament. This is an elementary approach. Firstly, when we see some of the Oldest Iconography of The Lord's Supper, the description is taken from The Book of John. On the Table, you will often see a Fish in a place where you would expect to see a lamb. This Icon is entirely Eucharistic. In John Ch. 6, we read of the miracle of Christ feeding the 5,000 with two fish and five barley loaves of bread. These loaves would have been leavened, and they were given at the time when The Passover was "at hand." This miracle feast took place during Christ's ministry while teaching at the sea side. Thr bread and fish filled the masses which which were present. Unlike Christ' institution of The Holy Eucharist at The Last Supper, St. John records a discourse of its significance at this event in John Ch. 6. Christ is the bread of life which came down from Heaven, and his flesh and blood are food and drink for those he has given life to. Those who do not have no life in them. He answers the questions of The Pharisees and his Disciplea regarding this matter. It is comprehensive and interactive theological discourse concerning the Sacrament's significance. The Eucharistic Feast is multiplied and offered for all who accept the sacrificial atonement of Christ in right Spirit and right Contemplation as St Paul explains in his 1st Epistle to The Church of Corinthians. 10; 11. John the Theologian does not record the institution of Eucharist in the Last Supper, but rather places it in the miracle of feeding of the 5,000, was with his disciples and his people. This. miracle was performed with Leavened bread. The Leavened Bread is the best bread offered as the First Fruits of the risen Christ who feasted with his disciples following his Resurrection. The rising of the Bread is the Resurrection (and ascension) of Christ from the tomb inside the Earth..... At the "Council of Florence" in the 15th Century between the Roman Church and Byzantine Catholics, it was decided that both leavened and unleavened bread were of valid use for The Sacrament. If we could learn ANYTHING from this, arguing points which is not emphasized or critical for our salvation, recorded in the Gospel narrative, it is not productive dialogue if you seek to invalidate one's ancient practice based on an elementary fixation which should not be dwelt upon when approaching the Chalice. When the disciples "broke bread" during Eucharistic fellowship, it was done the bread they had, and frequently.