The Duty of the Follower When He Can Not Hear Some Words of al-Fātiḥa and the Sūrah of Imam
Issue No. 1276- If a follower vaguely hears the imam’s sūrah al-fātiḥa and other sūrah, or hears a voice and does not know whether it is the voice of the imam or of someone else, the obligatory precaution is that he should not recite sūrah al-fātiḥa and the other sūrah.