Congregational prayers » Rules of congregational prayers
Islamic Laws; Ayatullah al Uzama Syed Ali al-Husaini Seestani
1470. It is necessary for the follower to recite all the things of the prayers himself, except Surah al-Hamd and the other Surah. However, if his first or second Rak'at coincides with third or fourth Rak'at of the Imam, he should recite Surah al-Hamd and Surah.
1471. If the follower hears Surah al-Hamd and Surah of Imam in the first and second Rak'at of the Fajr, Maghrib and Isha prayers, he should not recite them, even if he may not be able to distinguish the words. And if he does not hear the voice of the Imam, it is Mustahab that he should recite Surah al-Hamd and Surah silently. But if he recites them loudly by mistake, there is no harm.
1475. The follower should not recite Surah al-Hamd and Surah in the first and second Rak'ats of Zuhr and Asr prayers and it is Mustahab that instead of them he should recite Zikr.