Prayer: Hearing the Imam in Subh, Maghrib, and ʿIshaʾ Prayers
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 1442
If in the first and second rakʿah of the ṣubḥ, maghrib, and ʿishāʾ prayers a follower hears Sūrat al-Ḥamd and the other surah, then even though he is unable to distinguish the individual words, he must not recite Sūrat al-Ḥamd and the other surah. However, if he cannot hear the imam's voice, it is recommended that he recite Sūrat al-Ḥamd and the other surah, but he must recite them in a whisper; and in the event that he inadvertently recites them aloud, there is no problem.