Sa’ad ibn Abdillah narrated from Yaqub ibn Yazid, from Marwak ibn Ubayd, from Ahmad ibn al-Nadr, from a man, from Abu Ja’far عليه السلام, peace be upon him, who said: Imam al-Baqir عليه السلام said to me: “What do these people say about a man who has missed two rak’ahs with the imam (of prayer)?” I said: “They say he should recite ‘al-Hamd’ (Surah al-Fatihah) and a surah in the two rak’ahs.” Imam عليه السلام said: “This one reverses his prayer he makes its beginning into its end.” So I asked: “Then what should he do?” Imam عليه السلام said: “He should recite Surah al-Fatihah in each rak’ah.”