Al-Mabaadi-ul-Mufeedah is a book by The Noble Scholar The Sincere Advisor Abu Abdir-Rahman Yahya ibn Ali Al-Hajoorie. The book was first published in 6th edition in 1999.

In the book, Al-Mabaadi, the Arabic word for "The Authentic Knowledge", is the name of the book itself. The first chapter is called "The Reality of The Authentic Knowledge", and it contains the basics of Islam. This is followed by chapters on the fundamentals of mathematics, philosophy, and the sciences. In the last chapter, there are questions and answers from the Qur'an and Sunnah.

Al-Mufeedah contains answers to many questions that people ask, such as how to perform ablution, how to perform prayer, how to perform the Hajj and Umrah, how to perform the duties of the Muslim, how to perform fasting, and many other questions. It also contains answers to questions about the grave and resurrection, life after death, and other issues.

Al-Mufeedah also contains a section called "The Signs of Allah", which are verses from the Qur'an that show the attributes of Allah.

The book is written in a simple and easy language that is very easy to understand.