Before the revolution, the Law of God was a compulsory subject in primary and secondary schools. Now times have changed, but people strive on their own or in Sunday schools to learn this most important discipline, helping to touch the Holy Scriptures and the Tradition of the Church. The publications of the manual on the Law of God, prepared by Archpriests Serafim Slobodsky, Alexander Vvedensky, Maxim Kozlov, were widely known. Before you, dear reader, a completely new book. Its authors are representatives of two generations of the priestly dynasty of the Gumerovs: father - the inhabitant of the Sretensky monastery, hieromonk Job and his sons - priests Alexander and Pavel. The authors hope that their book will help readers enter the world of Orthodoxy, arouse interest in studying the foundations of the Christian faith.