How can the Coptic Orthodox Church be considered an Apostolic Church through St. Mark when his commission to evangelize Egypt is established primarily through Tradition rather than an explicit statement in Scripture?

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To understand the apostolicity of the Coptic Orthodox Church through St. Mark, it is important first to understand the relationship between Scripture and Tradition in the life of the Church.

The Coptic Orthodox Church, along with the other Orthodox Churches, completely rejects the doctrine of sola scriptura—the belief that Scripture exists independently of Tradition and is the sole authority for the Christian faith. Eastern Christians (Coptic, Syrian, Greek, etc.) revere the canonical Scriptures as authoritative and divinely inspired, but understand them as part of a much broader Holy Tradition through which the Holy Spirit has deposited and entrusted the Orthodox faith to the Church.

This Tradition includes the written Scriptures, the oral teachings and writings preserved by the Church Fathers and their interpretation of the canonical texts, the doctrines and Creed adopted in the Ecumenical Councils and other synodical gatherings, and even the orthopraxy (lived faith) of the living and reposed saints of the Church, among other elements. Scripture, therefore, is not separated from the Tradition of the Church but is understood and preserved within it.

St. Mark's apostolic ministry should likewise be understood within this broader context. Although Scripture does not explicitly record the words of Christ commissioning St. Mark to evangelize Egypt, Scripture provides substantial evidence of St. Mark's close participation in the apostolic ministry and his connection to the earliest Christian community.

St. Mark is referenced frequently in the Gospel, the Book of Acts, and the Epistles of St. Paul, demonstrating his participation in the evangelistic ministry of the Gospel of Christ. St. Paul, during his second imprisonment in Rome in the mid-60s AD, instructed Timothy to summon and send Mark to aid him in his final years of ministry (2 Timothy 4).

We also know that St. Mark was present with Christ in the Garden of Gethsemane during Christ's passion and betrayal (Mark 14), and so was also likely present at the Last Supper a few hours earlier.

Scripture also identifies the house of Mary, the mother of John Mark (Acts 12), as an important gathering place for the earliest Christian community in Jerusalem. According to the longstanding understanding of the Church, this was the upper room in which significant events of the early Christian faith took place: Christ instituted the Mystery of the Eucharist on Covenant Thursday; Christ first appeared to the disciples declaring His Resurrection; Christ reappeared on the following Sunday to reassure St. Thomas of the Resurrection; the Holy Spirit descended upon the disciples in the form of tongues of fire on the day of Pentecost; and Peter preached from this same setting to the thousands gathered in Jerusalem on that day. It was also at St. Mark's house that Peter returned to reunite with the disciples after his miraculous escape from prison.

The Church has preserved the tradition that St. Mark was commissioned to preach the Gospel in Egypt and that he ultimately shed his blood for Christ in Alexandria. This apostolic tradition is not an isolated claim, but is supported by the early and continuing witness of the Church concerning St. Mark's ministry.

St. Mark's apostolic connection is therefore understood through both Scripture and Holy Tradition. Scripture provides evidence of his close association with Christ and the Apostles and his participation in the early ministry of the Church, while Holy Tradition preserves the apostolic testimony concerning his mission to Egypt and the establishment of the Church in Alexandria.

The apostolicity of the Coptic Orthodox Church is consequently not dependent upon finding a single verse explicitly stating that St. Mark was sent to Egypt. Rather, it is grounded in the continuous witness of Scripture, Holy Tradition, the writings and testimony of the early Church, and the historical and archaeological evidence preserved concerning St. Mark and the Church he established in Alexandria.

Through St. Mark, the Coptic Orthodox Church traces an unbroken apostolic succession to the earliest Church and continues to preserve the faith that was entrusted to the Apostles and handed down through the generations.