Epistle to the Ephesians 14Exhortation to meet together frequently for the worship of God.

Ignatius · The Ante-Nicene Fathers Volume I: The Apostolic Fathers with Justin Martyr and Irenaeus by Philip Schaff

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Take heed, then, often to come together to give thanks to God, and show forth His praise. For when ye assemble frequently in the same place, the powers of Satan are destroyed, and the destruction at which he aims is prevented by the unity of your faith. Nothing is more precious than peace, by which all war, both in heaven and earth, is brought to an end.