Sunan an-Nasa'i 1224

Humayd ibn Mas‘adah reported to us; he said: Yazid—namely, Ibn Zuray‘—reported to us; he said: Ibn ‘Awn reported to us, from Muhammad ibn Sirin. He said: Abu Hurayrah said: The Prophet (ﷺ) led us in one of the two ‘isha-time prayers. Abu Hurayrah said: But I have forgotten which one. He said: He led us in two rak‘ahs, then said the taslim and went to a piece of wood lying across the mosque. He placed his hand on it as if angry. The people who were quick to leave rushed out through the mosque doors, saying, “The prayer has been shortened.” Abu Bakr and ‘Umar (may Allah be pleased with them both) were among the people, but they were too awed to speak to him. Also among them was a man with long hands, who was known as Dhul-Yadayn. He said: “O Messenger of Allah, did you forget, or has the prayer been shortened?” He said: “I did not forget, and the prayer has not been shortened.” He said: “Is it as Dhul-Yadayn says?” They said: “Yes.” So he came and completed what he had left out, then said the taslim. Then he said the takbir and prostrated, as long as his usual prostration or longer. Then he raised his head and said the takbir; then he prostrated, as long as his usual prostration or longer. Then he raised his head and said the takbir.