Prayer: Prioritising Immediate Obligations Over Prayer
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 741
If there is ample time for prayers and a creditor asks to be paid what he is owed, one must first pay his debt and then perform his prayer, if this is possible. Similarly, if some other obligation arises that must be performed immediately ‒ for example, one sees that the mosque has become impure ‒ he must first purify the mosque and then perform his prayer. In both cases, in the event that he first performs his prayer, he commits a sin but his prayer is valid.