Chapter on Rulings on Forgetfulness (Sahw) in Prayer and What Requires Repeating of Prayer

As for what was narrated by Sa‘d bin Abdillah, from Ahmad bin Muhammad, from al-Husayn, from Fadalah, from Sayf bin Umayrah, from Abu Bakr al-Hadrami: He (Abu Bakr al-Hadrami) said: “I led my companions in the Maghrib prayer, and when I had prayed two rak‘ahs, I performed the taslim. Some of them said, ‘You only prayed two rak‘ahs.’ So I repeated the prayer. Then I informed Abu Abdillah عليه السلام, peace be upon him. Imam عليه السلام said: "Perhaps you repeated it?" I said: "Yes." Imam عليه السلام laughed and then said: "It would have sufficed you to stand and perform one rak‘ah. The Messenger of Allah سبحانه وتعالى, peace be upon him and his family, once forgot and performed the taslim after two rak‘ahs.” And then He عليه السلام mentioned the narration of Dhu al-Shimalayn, and said: “Then he stood and added two rak‘ahs to it."