Musannaf Ibn Abi Shayba 3:5439

Ibn Numayr narrated to us, from Muhammad ibn Ishaq, from Hakim ibn Hakim, from Ali ibn Abd al-Rahman, from Hudhayfah, who said: I went out with the Messenger of Allah, peace and blessings of Allah be upon him, to the Harrah of Banu Mu'awiyah. He prayed the Duha (forenoon) prayer, eight rak'ahs, and he prolonged them.