From the early church fathers, three foundational texts of faith and practice endure: the Didache, the Didascalia Apostolorum, and the Apostolic Tradition. Written to guide believers in worship, morality, and community life, these manuals reveal how the early Church understood the sacraments, prayer, charity, episcopal authority, and more. In these pages, Dear Reader, you will encounter the living heartbeat of apostolic Christianity-simple, disciplined, and aflame with reverence. These writings speak across the centuries with a voice both pastoral and commanding, uniting doctrine with daily devotion. Preserved through eras of persecution, upheaval, and renewal, these Apostolic Manuals open a window into the unity and order that shaped the earliest believers. They invite modern Christians to recover the rhythm of a Church that prayed with one heart, lived as one body, and believed as one mind under the Lordship of Christ.