Prayer: Praying in the Shrines of the Infallible Imams
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 881
Performing prayers in the shrines (ḥarams) of the Infallible Imams (ʿA) is recommended; indeed, it is better than performing them in a mosque. It has been reported that a prayer in the sacred shrine of His Eminence, the Commander of the Faithful [Imam ʿAlī] (ʿA), is equal to 200,000 prayers.