Sa’ad ibn Abdillah from Muhammad ibn al-Husayn ibn Abi al-Khattab from al-Hasan ibn Musa al-Khashshab from Ali ibn Asbat from some of his companions from Abi Abdillah عليه السلام, peace be upon him, and Abi Ja’far عليه السلام, peace be upon him: Imam عليه السلام was asked concerning a man who is behind an imam (of prayer) but does not follow him in prayer, and the imam (of prayer) precedes him in the recitation. Imam عليه السلام said: “If he has already recited the ‘Umm Ul Kitab’ (Surah al-Fatihah), it suffices him. He interrupts (his own recitation) and bows.”