Prayer: Reciting the Quran and Supplicating
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1121
During prayers, there is no problem in reciting the Qur’an[1] – apart from the four verses of obligatory sajdah – and there is also no problem in supplicating. However, the recommended precaution is that one should not supplicate in a language other than Arabic. (The rule regarding the four verses of obligatory sajdah is mentioned in the section on qirāʾah, Ruling 969.)
-Ayatullah Sistani, Practical Laws of Islam, Prayer (Salah)
1
Although as mentioned in Ruling 1078, it is disapproved to recite the Quran in sajdah.