The Book of Fathul Mu'in is one of the monumental works of ulama muta'akhirin from the Shafi'iyah circles which is the standard book for Islamic boarding schools in Indonesia. Even in some pesantren, the book is a benchmark for students in mastery of the book of the Salaf. A small book that has a lot of advantages compared to other books and is taught in almost all pesantren that have the direction of Sunnah Shafi'iyah experts in this World.
The Book of Fathul Mu'in is the Book of Syrian Qurrotul 'Ain Fi Muhimmatu al Din, a Syarah which explains ma'na murod, generates the purpose and explains some of the principles, as explained in the muqoddimah of the book.
The Book of Qurrotul 'Ain itself is the work of Syeh Zaenudin al Malibari himself, a very blessed book, as acknowledged by Syeh Bakri Satho in his Hasyah I'anah, because this book has been prayed by its authors who must pray for it to bring benefit the readers