Musannaf Ibn Abi Shaybah

Ibrahim and Hazrat Ali (may Allah be pleased with him) bin Mudrik narrate that Hazrat Alqamah led us in prayer and, by mistake, performed five rak‘ahs. When he finished with salam, the people informed him that he had led five rak‘ahs. He turned to one of the people and said, "O one-eyed man! Did this really happen?" He replied, "Yes." Then Hazrat Alqamah performed two prostrations of forgetfulness (sujood as-sahw).