Specifying certain days for doing certain acts of worship
Q 1: We are some knowledge seekers. All praise be to Allah, we are currently studying the book "Fath Al-Majid fy Sharh Kitab Al-Tawhid" and the juristic book "Subul Al-Salam Sharh Bulugh Al-Maram". The problem is that we suffer from some sort of slackness and
one of our knowledgeable brothers, although none can verify this but Allah, suggests that we specify certain days each week to offer Qiyam-ul-Layl (optional Prayer at night).
He advised us to visit the graves, fast, visit sick people and do similar acts, and to guarantee that we are serious, the person who slackens has to pay a sum of money. Some of us agreed while others wanted to make sure of this method's legality first by asking trustworthy scholars. Please advise us in this regard.
The suggestion you mentioned in your question is not valid and you should not commit yourselves to it, as there is no evidence in the Qur'an and Sunnah (whatever is reported from the Prophet) supporting it. Taking money through this means is not permissible. Moreover, anyone who wishes to do good should do so without entering into a similar commitment.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.