Pope Shenouda III
In prayer for example, there is individual prayer; you pray in your room, to your Father who sees in secret. This does not cancel the existence of communal prayer for all the groups of believers to pray in one spirit, in one soul and in one voice. Examples of such prayers are numerous in the New Testament. One of these examples is the prayer of the believers after the release of Peter and John from prison: "So when they heard that, they raised their voice to God with one accord and said..." (Acts 4: 24).
Of course the Lord's commandment regarding praying in secret (Matt.6: 6) does not apply to such prayer.