ما لا يسع المسلم جهله

This book deals with what every Muslim should learn from the matters of his religion. He mentioned important issues in the chapter on creed, and the corruption that a Muslim might become unaware of its contents, and what it requires of taking precautions and being careful about what contradicts it, and he also talked about the importance of following the Messenger - may God bless him and grant him peace - in everything that a Muslim does in the section of acts of worship and transactions. And it carries great importance for everyone who wants to know Islam in a succinct and correct manner.