This book is about how it was created, what it taught, why it was forgotten, and how the earliest written source of Christianity that has reached us was rediscovered: the Teachings of the Twelve Apostles (Didache). Being written before the canonical Gospels and the original letters of the Apostle Paul, the Didache is the key to understanding the entire New Testament, the life and works of Jesus of Nazareth and his early followers. The book is the result of many years of scientific research. The publication includes a modern annotated translation of the Didache.