What is the mystery of communion in the eucharist?

The answer

It is the mystery of uniting us the faithful with the Savior by partaking of His Body and Blood which He gave up for us. Thus, our whole being, including our bodies, is sanctified and is blessed by His eternal glory.

Fr. Tadros Yacoub Malaty

Fr. Tadros Yacoub Malaty, Catechism of the Coptic Orthodox Church, Volume 1, Books 1–3. First English Edition, 2023. Published by St. George Coptic Orthodox Church, Sporting, Alexandria, and Queen St. Mary & Prince Tadros Coptic Orthodox Church, South Brunswick, NJ. Copyright © 2023. Translation and Editing: Youth of the Coptic Orthodox Church in the USA, Canada, Europe, Australia, Arabian Gulf, and Egypt.