In this book, the author, Muhammad Ibn Abd al-Wahhab, has compiled a number of major sins—acts that we are religiously commanded to abandon and forbidden from committing. It is a valuable work encompassing various major sins to which every Muslim ought to devote their attention—by gaining knowledge of them and guarding against falling into them. The author has selected those matters of particular relevance to the vast majority of people. We therefore implore Allah the Almighty to safeguard us and all Muslims from sins and acts of disobedience, and to grant us all a blessed and happy conclusion to our lives. Presented here is the commentary on this book by Sheikh al-Fawzan.