In “The Complete Testimony of the Fathers of the First Three Centuries Concerning the Sabbath and First Day,” John Nevins Andrews meticulously compiles and analyzes the writings of early Christian leaders, illuminating their perspectives on the Sabbath and Sunday observance. With a scholarly approach, Andrews delves into primary sources, employing an expository style that blends rigorous textual analysis with historical context, shedding light on the evolution of Christian worship practices. The work situates itself within the broader discourse of theological debates, particularly pertinent to the Adventist tradition, highlighting how interpretations of the Sabbath have influenced Christian doctrine across centuries. John Nevins Andrews, a prominent Adventist theologian and the first official missionary of the Seventh-day Adventist Church, was driven by a deep commitment to scriptural integrity and a desire to restore practices believed to be central to the early church. His extensive background in theology and history, combined with his advocacy for the observance of the Sabbath, informed his rigorous examination of early Christian writings. Andrews' conscientious efforts reflect an attempt to reclaim what he perceived as a forgotten truth among contemporary followers of Christ. This book is a compelling resource for anyone interested in the historical foundations of Christian worship, especially those engaged in the ongoing debates about Sabbath observance. Andrews' thorough research and articulate presentation make the text not only informative but also essential for theologians, historians, and practitioners seeking a deeper understanding of early Christianity's relationship to the Sabbath.