"উপদশ আইন রসল ছ বই" is an Android application developed by Bangla Public Library, available for free. The app features Abdur Razzaq bin Yusuf's renowned book "Advice, Ain Rasool (sm)" which discusses the importance of recognizing false teachings in the context of Islamic law. The book emphasizes the significance of following authentic sources in understanding and practicing the Shariah.

Incorporating teachings from Prophet Muhammad (sm), the app aims to educate Muslims on the necessity of seeking knowledge supported by evidence. By highlighting the dangers of fabricated stories and false interpretations, it encourages users to uphold the true principles of Islam. The entire book is conveniently accessible within the app, providing valuable insights for users seeking authentic Islamic knowledge.