The mandatory fasting application is quoted from the book of Ri'ayatul Himmah volume I by KH Ahmad Rifa'i - Kalisalak Limpung, Batang Regency, Central Java.

This book is in Javanese language and is written in Arabic Pegon script. Discussing the procedures and related things such as the conditions of fasting, the pillars of fasting, and those that invalidate the fast

Starting from the lafadz "It is mandatory to fast in the month of Ramadan sabab wilangan, complete telungti in the month of Sha'ban"